Medium with pattern

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a paneed medium having a land area for storing data and a trough area for prohibiting memory storage, and this pane together with a read wide / write narrow recording head. Regarding the method of using the attached medium.

【0002】

[Conventional technology]

Cross-reference of related applications This application claims priority to US Provisional Application 60/269517 filed on February 16, 2001.

【0003】

A magnetic disk drive is a digital data storage device that stores a digital data on a magnetic medium known as a disk. A disk generally includes a plurality of tracks for storing a digital day. The data is stored on the disk track in the form of magnetic polarity transitions induced in the magnetic layer covering the disk.

【0004】

During the operation of the disk drive, the disk rotates around an axis by spin motion at a substantially constant angular velocity. To transfer data to and from the disk, a converter known as the recording head is centered above the rotating disk track. After centering, the head can be used to transfer data to the track (during write operation) or transfer data from the track (during read operation). During writing, for example, a writing current is sent to a centered head to generate an alternating magnetic field at the bottom of the head that induces a magnetic polarity transition on the track. During reading, the centered head detects the magnetic field emanating from the magnetic polarity transition on the moving track and produces an analog read signal that represents the data on the track.

【0005】

The recording head can be a dual element having a read element for performing a read operation and a write element for performing a write operation. Write elements to write elements, provided that the write element contains an erase band on its edge that "erases" the old data from the disk traffic, thereby preventing the read element from detecting the old data. It is known to be wider. This configuration is described in US Pat. No. 5,940,250 (McNeil et al.).

【0006】

[Patent Document 1]

U.S. Pat. No. 5,940,250 [0007]

[Problems to be Solved by the Invention]

The present invention is to provide a novel magnetic recording paper station capable of accurately recording data.

【0008】

[Means for solving problems]

In general, in one aspect, the invention is from a paned medium consisting of a land area and a trough area, a writing element that writes data to the paneed medium, and a date from this paneed medium. A magnetic recording system that includes a reading element to read. Read elements are wider than write elements. The land area memorizes the day, and the trough area interferes with the memory of the day. That is, the trough area prevents old data from being written outside the land area and allows the reading element to widen the width of the reading element without causing the reading element to detect noise outside the trough. By increasing the width of the reading element, the signal-to-noise ratio can be significantly favored in the system.

【0009】

The aforementioned aspects can include one or more of the following features: The read and write elements can be part of a recording head that flies over the paneed medium during reading and writing. The trough region can have sufficient depth to the recording head to prevent magnetic writing of data to the trough region. The paneed medium can be made up of a layer of layers placed on the substrate, which defines the land and trough areas. Examples of substrates include lath substrates, NiP rad al-niu alloy substrates, lath lath substrates, and tiniu substrates. The key layer also includes a magnetic layer. The read element can have a read width wider than the write width of the write element.

【0010】

The paneed medium can include a rotatable magnetic disk with a track for storing data. The trabe can be a concentric circle, a helix, or any other configuration. The track can include the land area. The troughs can be separated on a rotatable magnetic disk by a trough region. The land area can include day islands separated from each other by a trough area. Each day island can store one bit.

【0011】

In general, in another aspect, the invention is directed to a disk drive that includes a magnetic disk with multiple tracks for storing data. The trough includes a land area for storing data and a trough area that substantially separates the land areas from each other. The disk drive also includes a recording head that transfers data to and from the magnetic disk. The recording head contains a write element and a read element. The read element has a width wider than the width of the write element.

【0012】

This aspect of the invention can include one or more of the following features: An engine can be included in the drive to position the head on the disk. The recording head can fly over the disk during reading and writing. The trough region can have sufficient depth to the recording head to prevent magnetic writing of data to the trough region. The magnetic disk can be a paned medium consisting of a layer of layers arranged on a substrate. The key layer defines a land area and a trough area, and includes a magnetic layer on the upper surface.

【0013】

The land area on the trough can contain day islands separated from each other by the trough area. Each day island can store at least 1 bit. The track can have a different density at the inner diameter of the magnetic disk than at the outer diameter of the magnetic disk. The trough region can function as an erasing band during writing on the magnetic disk.

【0014】

The width of the read element is the value R_minAnd value R_maxCan be between, however, R_min= TW and R_max= TW + 2GAP-2RTMR, in the above equation, TW corresponds to the track width, GAP corresponds to the distance between adjacent tracks, and RTMR is the misalignment of the reading element on the track. Corresponds to.

【0015】

The width of the write element is the value W_minAnd value W_maxCan be between, however, W_min= TW + WTMR and W_max= TW + 2GAP-2SQ, in the above equation, TW corresponds to the track width, GAP corresponds to the distance between adjacent tracks, and WTMR corresponds to the misalignment of the writing element on the track. Correspondingly, the SQ corresponds to the decrease in the distance between the tracks due to the misalignment of the writing element.

【0016】

In general, in another aspect, the invention is directed to a magnetic storage medium with a pane. The storage medium includes a substrate and a layer formed on the substrate. This layer defines the land area and the trough area. The land area memorizes the day, and the trough area interferes with the memory of the day between the land areas. This aspect of the invention can include one or more of the following features:

【0017】

The land region can be projected higher than the trough region in relation to the substrate. The trough region can have sufficient depth to the land region to prevent magnetic writing of the data to the trough region. The land area can include day islands separated from each other by a trough area. Each day island can store at least 1 bit. The land area is a concentric or spiral track, and the trough area separates the tracks from each other. The trough region can function as an erasing zone to prevent the writing of data between the land regions. The substrate can be a lath substrate, a NiP rad al-niu alloy substrate, a lath lath substrate, and / or a chiniu substrate, and the layer is on top. It is possible that the magnetic layer is arranged.

【0018】

In general, in another aspect, the invention is directed to a device that includes a storage means for magnetically storing data in a data track. Data tracks are separated by an erasure band physically sampled on the storage means. The device also includes a writing means for writing data to the storage means. The reading means reads the data from the storage means. The reading means has a width wider than the width of the writing means. This aspect can include one or more of the following features:

【0019】

The erasure zone can be a trough formed between days and tracks on the storage means. The storage means can be a paned medium formed of a layer of layers arranged on the substrate. The layer can include a data track and an erasing zone, and can have a magnetic layer on top. The reading and writing means can be part of a recording means that flies over the storage means during reading and writing. The erasure band can be a trough with sufficient depth to the recording means to prevent magnetic writing of the data on the trough. A day track can include a sequence of day islands separated by a trough.

【0020】

In general, in another aspect, the invention is directed to a magnetic recording system that includes a paned medium consisting of a land area and a trough area. The land area memorizes the day, and the trough area interferes with the memory of the day. This system includes a recording head that reads and writes data to the land area of the paned medium. The recording head has a reading element. The reading element has a width wider than the width of the land area. This aspect can include one or more of the following features:

【0021】

The recording head can include write elements that are narrower than the width of the read element and wider than the width of the land area. The trough region can have sufficient depth to the recording head to prevent magnetic writing of data to the trough region. The paneed medium can include a layer arranged on the substrate. The key layer can define a land area and a trough area, and a magnetic layer can be arranged on the upper surface.

【0022】

The paneed medium can be a rotatable magnetic device with a track that stores the data. Concentric circle tracks can be in the land area. The troughs can be separated on a rotatable magnetic disk by a trough region. The land area can include day islands separated from each other by a trough area. Each of the day islands can remember the block day. The block day can be 1 bit.

【0023】

In general, in another aspect, the invention is directed to a magnetic recording medium that includes a land area for storing data and a trough area for storing sir information. By storing the sir information in the trough area, it provides a continuous sir to the head that scans the recording medium, and at the same time, a medium that can be used to store a considerable amount of data. It is possible to increase the amount of space. This embodiment can include one or more of the following:

【0024】

The day in the land region can have a higher frequency than the sir information in the trough region. The trough region can include steps that are lower than the land region with respect to the trough. The step can contain sir information. The land area can be a day trough, with the first trough bordering one side of the land area and the second trough bordering the other side of the land area. It is possible to attach it. The sir information in the first trough can have a different frequency than the sir information in the second trough.

【0025】

The trough can contain at least one of the sir signals and Gray code. The land and trough areas can be alternating concentric or spiral tracks. Land areas can include day islands separated from each other by additional trough areas. Each of the day islands can remember the block day. The block day can be 1 bit.

【0026】

In general, in another embodiment, the invention is directed to a magnetic recording system that includes a paned medium consisting of a land area and a trough area. The land area stores data, and the trough area stores sir information. The system includes a recording head that reads and writes data to the land area of the paned medium and also reads sir information from the trough area. This aspect can include one or more of the following features:

【0027】

The recording head can include a read element and a write element. The read element can have a width wider than the width of the write element. The day in the land region can have a higher frequency than the sir information in the trough region. The recording head can be aligned close enough to the land area to read higher frequency data and close enough to the trough area to read lower frequency sir information. The trough region can include steps that are lower than the land region with respect to the trough. This step can include sir information.

【0028】

The land area can contain day troughs, with the first trough bordering one side of the land area and the second trough bordering the other side of the land area. It is possible to attach it. The sir information in the first trough can have a different frequency than the sir information in the second trough. The trough can contain at least one of the sir information and the Gray code.

【0029】

The land and trough areas can be alternating concentric or spiral tracks. Land areas can include day islands separated from each other by additional trough areas. Each of the day islands can remember the block day. The block day can be 1 bit. The paneed medium can be a rotatable magnetic disk with alternating tracks, including lands and troughs. The media with the pane can include a data ??? that stores the fade-lock loop information.

【0030】

The magnetic recording system can include a low frequency fill that receives data and sir information and outputs sir information, and a high frequency fill that receives data and sir information and outputs data. Is.

【0031】

In general, in another aspect, the invention is directed to a method of arranging data. This method involves moving the recording head over a paned medium consisting of a land area for storing data and a trough area for storing sir information, and transferring the day over the land area. Includes reading sir information from the trough area at the same time as transferring the data, and using that sir information to move the recording head to the land area. This aspect can include one or more of the following features:

【0032】

The land area can contain day troughs, with the first trough bordering one side of the land area and the second trough bordering the other side of the land area. It is possible to attach it. The sir information moves the recording head by comparing the sir information from the first trough with the sir information from the second trough and correcting the alignment of the recording head based on the comparison. Used for. The sir information in the first trough can have a different frequency than the sir information in the second trough. The recording head includes a read element and a write element, and the read element can have a width wider than the width of the write element.

【0033】

This summary is provided for a quick understanding of the nature of the invention. A description of an exemplary embodiment of the present invention is presented below.

【0034】

The same reference numbers in the various figures indicate the same elements.

【0035】

BEST MODE FOR CARRYING OUT THE INVENTION

During the read and write operation of the disk drive, the recording head is maintained in a centered position above the desired track with a procedure known as track tracking. When using dual element heads, this procedure inevitably involves centering the write element during the write operation and centering the read element during the read operation. For various reasons, the write element of a dual element head is not always alto at the center of the track when the corresponding read element is at the center of the track, and vice versa.

【0036】

FIG. 1 shows the dual element recording head 16 at various positions above the disc-18. This figure shows the upper diameter of the first track 20 at the outer diameter (OD) of the disc 18, the upper side of the second truck 22 at the inner diameter (ID) of the disc 18, and the medium diameter of the disc 18 ( The recording head 16 above the third track 24 in MD) is shown. The three heads shown in Figure 1 are for comparison purposes only. It should be understood that in general, there is only one head above each disk surface in the drive. It should also be understood that the dimensions shown in FIG. 1 are exaggerated for illustrative purposes.

【0037】

As shown in FIG. 1, the recording head 16 is arranged at the tip of an engineer 40 that supports the recording head above the surface of the disc 18. The Achu Ah 40 rotates around a rotation point (not shown), and the angle formed by the center line of each track of the Ah 40 seems to vary over the surface of the disk. It has become. This horn is known as the sew horn. The recording head 16 includes a read (RD) element 26 having a center defined by the center line 30 and another write (WR) element 28 having a center defined by the center line 32. As shown, the centerline 30 of the read element is intentionally offset laterally from the centerline 32 of the write element. Due to the combined effect of the horn and the offset between the read and write elements, the read and write elements 28 are usually centered on the same track on the disk 18 at the same time. Absent. That is, one of the two elements is centered on a particular track and the other is generally off-centered by some amount.

【0038】

A circuit system (not shown) that properly aligns the recording head 16 using the feedback information read from the disk 18 by the read element 26 to perform the track tracking function is generally implemented. Has been done. The read element 26 provides feedback information to the server system, so if no additional information is supplied to the server system, the system centers the read element 26 instead of the write element 28. Therefore, if no additional information is provided to the server system during the write operation, a compensating value to center the write element 28 is passed to the server system. This compensation value passed to the sir system generally varies across the surface of the disk, based on the combined effect of the horn and the offset between the elements.

【0039】

The centerline of the recording head element and the desired track centerline during normal disk drive operation, even when the circuit system is used by the disk drive to align the head. There may be some misalignment between. This misalignment can be, for example, spindle runout, resonance, and disk flare, thermal track shift, head subsidence, attitude interaction, improper sir writing, and more. It is caused by various factors. For a particular disk drive, poor alignment between the head element and the track during normal track tracking is identified by the track misalignment (TMR) value. The TMR value represents the maximum range of element misalignment that is likely to occur during the normal track tracking operation of a disk drive. That is, while the drive is tracking, it is likely that the centerline of the element is somewhere within the range specified by the TMR value, and the head is unlikely to be outside this range. In general, TMR is a statistically derived value based on past observations in a similar or identical disk drive system.

【0040】

One ip dual element recording head is a magnetoresistive head that includes a magnetoresistive (MR) reading element and another write element that is normally inductive. The MR reading element contains a small piece of magnetoresistive material with a variable resistivity that changes based on the applied magnetic field. That is, as the magnetic field applied to the material increases, the resistivity of the material usually decreases. In practice, the MR material is held in the vicinity of the desired track by passing a substantially constant current through the material. Fluctuations in the magnetic field generated by magnetic transitions on a rotating track change the resistance of a magnetic material, resulting in a variable voltage (ie, a read signal) flowing through that material that represents the data stored on the disk. Is done. MR reading elements have become quite popular in recent years because they typically produce a read signal with a voltage much higher than that produced by an inductive reading element.

【0041】

In the past, dual element heads used a write-wide / read-narrow approach. However, this approach has been shown to pose problems related to nonlinear sir-position signal transfer functions. Therefore, a read wide / write narrow dual element head was developed. In a read-wide / write-narrow dual-element recording head, the width of the read element exceeds the width of the write element.

【0042】

Figures 2A-2C show the use of a dual element recording head 42 with a read wide / write narrow configuration on non-panned media. In this example, the non-panned medium is a recording medium such as a magnetic disk whose recording surface is substantially smooth. That is, the non-panned medium does not include the physically stamped land and trough regions described below.

【0043】

The dual element recording head 42 includes a write element 44 having a write width (W) and a read element 46 having a read element width (R), and the read width is wider than the write width. The recording head 42 also includes a read element center point 48 and a write element center point 50 that are substantially laterally offset from each other with respect to the direction of movement 52 of the recording head. Boundaries 54A and 54B represent TMR boundaries for day track 56.

【0044】

Further, the write element 44 includes erase bands 58A and 58B for creating magnetic erase bands on both sides of the data written on the track 56 by the write element 44. The magnetic erasure band is formed from the magnetic flux at the edge of the writing element 44. This magnetic flux is inherent in all writing elements and can be increased to increase the size of the magnetic erasure band or decreased to decrease it. The operation of the magnetic erasing band is not absolutely necessary for the present invention, but a description of its operation will facilitate an understanding of the benefits provided by the paneed media described below.

【0045】

FIG. 2A shows the first write operation for the track 56 using the dual element recording head 42. During the first write operation, the write element 44 is centered on the left TMR boundary 54A and therefore writes the first day 60 on the track 56 off-center to the left. The magnetic erasure bands 58A, 58B of the write element 42 create the first erasure strips 62A, 62B. In this example, erase strips 62A, 62B include an area of track 56 where no readable data is stored.

【0046】

FIG. 2B shows the second subsequent write operation for the track 56. During the second write operation, the write element 44 is centered on the right TMR boundary 54B and therefore writes the second day 66 on the track 56 off-center to the right. Further, the erase bands 58A and 58B of the write element 44 create the second erase strips 68A and 68B on both sides of the second day 66 during the second write operation. As shown, the second erase strip 68A on the left side of the day 66 erases all of the first day 60 that would otherwise remain on the track 56 after the second write operation. This causes the read element 46 to not detect the first day 60 on track 56 during subsequent read operations in Figure 2C.

【0047】

Instead of or in addition to having a magnetic erasure band on the writing element, it is possible to physically form (eg, sample) an effective erasure band on the paneed medium. .. The paneed medium is a magnetic storage device such as a magnetic disk that includes a land region (land) and a trough region (trough). Referring to FIG. 3, lands 70 (70a-70c) are the protruding regions of the paneed medium 72, and troughs 74 (74a, 74b) are depressions located between the lands 70.

【0048】

Referring to FIGS. 3 and 4a, the paneed medium 72 is a magnetic disk consisting of a substrate 76 and a layer 78 disposed on the substrate. An example of a lily that can be used is plastic, but other ips can be used in place of or in addition to plastic. Instead of using a layer, a layer consisting of a glazing compound containing a series that is treated in an uncured state and later cured at high temperatures can be used. The following paper describes the process for creating such layers. Tohge et al., "Fine Patterning On Glass Substrates By The Sol-Gel Method", Journal of Non-Crystalline Solids 100 (1988), 501 ~ 505? Examples of substrates that can be used as substrate 76 include, but are limited to, lath substrates, NiP al-niu alloy substrates, lath lath substrates, and chiniu substrates. Not done. A magnetic layer (not shown) is attached onto the layer (or series / gel) layer before or after sampling the pane. Sample the land / trough pane onto layer 78 of the medium using a mold that holds the inverted land / trough pane.

【0049】

The trough has sufficient depth to the recording head and / or land to prevent the data from being stored in the trough at the frequency at which the data is written. During the write operation, the read wide / write narrow record head is aligned on the land so that the land is effectively barbed by both the read and write elements. The read element is wider than the write element, and the write element is at least as wide as the land and can be wider.

【0050】

During writing, the recording head "flys" or moves over the paneed medium. The trough is far enough away from the recording head to prevent the data from being written inside the trough, and preferably to prevent it from being written. That is, the trough is sufficiently far from the recording head that the magnetic flux transitions generated by the writing element are prevented from affecting the magnetic polarity of the region of the medium defined by the trough. The land, on the other hand, is close enough to the recording head to allow magnetic writing of the day on the land.

【0051】

Therefore, when a day is written to the media 72 with a pane, the land constitutes a day track and the trough constitutes an effective erasure zone. Lands and troughs on a circular magnetic disk can be formed as alternating concentric circles (taking into account any circuit formed on the magnetic disk). Troughs separate lands (ie, day tracks) from each other to form well-defined day tracks, both physically and magnetically. Alternatively, lands and troughs can be alternating. Other track configurations can also be used.

【0052】

FIG. 4b shows a top view of the paneed medium of FIGS. 3 and 4a. As shown in FIG. 4b, the recording head 80 including the read element 82 and the write element 84 is aligned on the land 70a (day track). In one pass, write element 84 writes a day to the land. Day? Is not written to troughs 74a and 74b adjacent to land 70a. The reason is that the write element 84 is too far above the trough in the vertical direction (arrow 73 in Figure 3) to induce a magnetic transition into the trough at the frequency at which the data is written. ..

【0053】

Thus, if a new day is written on land 70a, for example, in the second pass by write element 84, the remaining day from the first pass is present in land 70a, or in troughs 74a and 74b. Must not be. Therefore, when the read element 82 reads the day from the track 70a, only the day from the second pass is read. To achieve these advantages, constraints can be placed on the width of the read element and the width of the write element.

【0054】

With reference to Figure 4b, the constraints on the width 88 of the read element 82 and the width 90 of the write element 84 are determined as follows: Minimum width of read element (R_min) Can be constrained as follows. R_min= TW In the above equation, TW is the width of the track 70a (ie, land) formed on the paneed medium 72. The width of the read element must not be less than the track width, i.e. R TW. Minimum width of write element (W_min) Can be constrained as follows. W_min= TW + WTMR In the above equation, TW is as defined above, and WTMR is the amount of misalignment of the write element (ie, the amount of TMR that can occur with respect to the write element 84).

【0055】

The read element TMR (RTMR) is the amount of TMR that can occur with respect to the read element 82. Recording Head Minimum Off Track Registration Capacity (OTRC)_min) Is defined as follows. OTRC_min= (R-TW) / 2 = RTMR The track interval (Ts) is defined as the sum of the TW and the gap (GAP) between adjacent tracks such as 70a and 70b. Ts = TW + GAP Swee (SQ) is the amount by which the cap between adjacent tracks can be reduced when the write element 84 extends beyond the width TW of the track 70 to the trough 74a. The suite is defined as follows. SQ = WFG + Overshoot In the above equation, WFG is a "write fault gate" that corresponds to a predetermined limit that can be written when the head is off-track, whose size is determined by the sir position information, and also "Overshoot". Is the amount by which the recording head exceeds WFG when writing during a seat or during a show-in. Overshoot is a constant that is empirically determined based on the drive parameters, especially the sir bandwidth.

【0056】

Sweet condition (O_SQ) The OTRC below is defined as follows by setting the suite to ro. O_SQmargin= Ts-TW / 2-W_max/ 2-SQ In the above formula, W_maxIs the maximum width of the write element 84, and Ts, TW, and SQ are defined as above. O_SQmarginBy setting to? B and replacing "Ts" with "TW + GAP", the following equation is obtained. 0 = TW + 2GAP-TW / 2-W_max/ 2-SQ W_maxSolving with respect gives the following equation: W_max= TW + 2GAP-2SQ Maximum width of read element (R)_max) Can be defined as follows based on the structure of the paneed medium and the dual element recording head. R_max= TW + 2GAP-2RTMR [0057]

Panned media can significantly increase the read width of read elements compared to the read elements used in non-panned media. One reason for this is that the trough prevents old data from being written out of the data track, and the width of the read element without the fear that the read element will detect a significant amount of old data. This is because it becomes possible to expand. For example, in one embodiment where the TMR tolerance and track width tolerance are adjusted to 110,000 trams / inch (TPI), the width of the reading element is more than doubled to 0.10 ?? Ron (μm). ) Can be 0.22 μm. Also, by increasing the width of the reading element, the signal-to-noise ratio (SNR) becomes advantageous. That is, for example, the amount of effective data increases with respect to noise from old days. Using paneed media and read wide / write narrow recording heads, it is possible to obtain, for example, an improvement in 6-decir (db) SNR.

【0058】

The present invention is not limited to the embodiments described above. The data track on the paneed medium can have the same or different track densities or bit densities at the inner diameter of the magnetic disk as at the outer diameter of the magnetic disk. For example, a day truck can have a higher density at the inner diameter and at the outer diameter. That is, Ts can be different.

【0059】

The day track can include a day "island", as shown in Figure 5. Each of these day islands 100 holds a day block and is separated / isolated from each other by a trough 102 within the day track itself. The day block consists of one or more bits. Similar to the trough 74 between the day troughs, the trough 102 between the day islands 100 has sufficient recording heads and / or day islands to prevent magnetic writing of the day to the trough area 102. (The depth of trough 74 and the depth of trough 102 do not have to be the same). This configuration provides additional benefits by reducing the amount of noise detected by the reading element (eg, noise between tracks).

【0060】

Sir information (for example, position error information) can also be stored on the land. The sir information can be stored on the land using the sir burst at the start of each magnetic disk. For example, referring to FIG. 4, recording sir information on two or more subtracks (eg, parts of tracks 70a, 70b, and / or 70c) within a particular ??? of a magnetic medium. Can be done. Alternatively, referring to FIG. 5, the sir information can be stored on the "day island" and, in fact, can be determined by the frequency and arrangement of the day island itself.

【0061】

In an alternative embodiment, the trough of the paneed medium can include data such as sir information. Sir information can be written (as a magnetic transition) to the bottom (or "floor") of the trough at a frequency lower than the day written to the land. For example, sir information can be written at 1 MHz (MHz), and data can be written on the land at 19 to 250 MHz. By writing data and data at these or other frequencies, read elements such as the read element on the read wide / write narrow recording head 80 can detect both data and data. become.

【0062】

More specifically, the recording head can detect high density data at close range. The recording head can also detect low density data at a greater distance. Therefore, the data can be written at high density on the land closer to the recording head, and the sir information can be written at lower density in the trough farther from the recording head. Therefore, the recording head can detect both at the same movement altitude at the same time. In this embodiment, the reading element is wider than the land and therefore extends beyond the land to the trough on both sides of the land, allowing the reading element to detect both data and sir information.

【0063】

The formula that governs the reliability of the data in relation to the height of the recording head on the recording medium is called the Wallace formula. The Wallace formula is:

[Number 1]

<img file="JP2003248902A_D0001.tif" />In Wallace's equation, "FH" is the moving altitude of the recording head, that is, the distance on the recording medium, and "λ" is the wavelength distance between the two magnetic transitions that define the data, "V".₁Is the amplitude of the low movement altitude of the reading element on the digital transition on the land recording medium, "V"._hIs the amplitude of the high movement altitude of the reading element on the sir magnetic transition in the trough, and "ln" is the natural logarithm function.

【0064】

The altitude of movement (FH) that allows the reading element to read the low frequency magnetic transitions in the trough is determined by solving the Wallace equation. You can also use Wallace's equation to confirm that the reading element can detect high frequency magnetic transitions (ie, data?) On the land.

【0065】

Since the data is written at a high frequency (as opposed to the sir information), the writing element cannot write the data in the trough. As a result, the trough can act as a similarly effective erasure zone.

【0066】

Instead of writing the sir information on a trough with a smooth surface, paneed steps can be physically formed in the trough. The sir information includes a paneed step that produces a low frequency signal due to the abrupt changes in magnetization caused by the step itself. FIG. 6 shows an example of storing sir information (or even other data) in the trough of a magnetic recording medium 110 with a pane using a paneed step. ..

【0067】

In the example of FIG. 6, lands and troughs constitute alternating concentric circle tracks of magnetic disks, but the present invention is not so limited. As mentioned above, lands and troughs can be spiral or have any other configuration. As previously described for Figure 4b, lands 112a, 112b, and 112c are used to memorize the day. Lands can also include day islands, as previously shown in Figure 5. In this case, troughs 114a, 114b, 114c, and 114d include two rails, namely "floor" rails 116 and step 118, as depicted in Figure 6b (line 120 in Figure 4b is of the trough. Indicates the difference in depth). Step 118 has a height lower than the height of the land with respect to floor 116. The sir information includes steps arranged at frequencies lower than the data written on the land, as described above.

【0068】

If the floor 116 of the trough is deep enough and the frequency of the steps is low enough, the sir information has a lower bandwidth than the data, but is still readable by the reading element of the recording head. The Wallace equation is used to determine the height of movement of the recording head relative to steps and lands, as well as the frequency of the data and the frequency of the sir information.

【0069】

The sir information stored in the trough (on the paneed steps or on the "floor" as a magnetic transition) is at different frequencies on both sides of the land. As shown in Figure 6, the sir information (for each of the paneed steps) is higher in the trough 114b on the left side of land 112b than in the trough 114c on the right side of land 112b. The frequency. The difference in the frequency of the sir information enables continuous sir of the recording head. That is, the controller (not shown) takes the amplitude difference between the sir information from trough 114b and the sir information from trough 114c. The magnitude of this difference indicates whether the recording head is pointing too far toward either trough. If it is oriented too far, the controller adjusts the position of the recording head to compensate for unwanted misalignment. The head is on track when the amplitude of the signal from 114b is equal to the amplitude of the signal from 114c.

【0070】

The sir information written to the trough can include sir signals and / or Gray code. The sir signal contains the data used to locate the recording head. The Gray code is a data that defines the traffic address of the data truck on the magnetic recording medium.

【0071】

As the recording head 120 moves over land 112b during operation, the reading element of the recording head (not shown) provides sir information in troughs 114b and 114c that border the right and left sides of land 112b, respectively. To detect. The reading element reads the data from the trough as well as the data from the land. See Figure 7. Sir information and data are transmitted from the read element 120 to the preamplifier. The preamplifier 122 amplifies the signal read by the read head and transmits the amplified signal to the low frequency fill 124 and the high frequency fill 126.

【0072】

The low frequency fill 124 transmits low frequency sir information from troughs 114b and 114c to the controller. The controller compares the sir information from trough 114b with the sir information from trough 114c (eg, take the difference between them). The controller compares the value of the resulting difference with one or more predetermined values to determine if the recording head is pointing too far towards either trough. If it points too far, the controller issues a signal to correct the position of the recording head.

【0073】

The high frequency fill 126 receives the output of the preamplifier 122 and receives only the high frequency signals, namely the data from the land, and the PLL (Fay Lock Loop) information (dedicated on the magnetic recording medium). Only the frequency information that can be included in the data) is passed.

【0074】

By storing the sir information and the Gray code in the trough, the dedicated day is also compared to the recording medium that stores the sir information and the gray code in the dedicated day. The size of the? Can be made larger. As a result, there is more room for data on the recording medium.

【0075】

The present invention is not limited to the specific embodiments presented above. It is possible to combine different features of different embodiments. For example, in a single magnetic recording medium with a pane, the day island of FIG. 5 can be combined with the stepped trough of FIG. The magnetic recording medium of the stepped trough can be formed in the same manner as the other paned media described above. In this regard, the paneed medium is not limited to the layer on the lath substrate. Any type of press-workable magnetic recording material can be used. The paneed medium is not limited to magnetic disks or other rotatable media. The paneed medium can be magnetic tape or the like.

【0076】

In addition, other embodiments not specifically described in the present specification are also within the scope of the above-mentioned claims.

[Simple explanation of drawings]

[Figure 1]

It is a figure which shows the position between a read element and a write element in a dual element recording head, and the effect which this offset has when aligning a head on various tracks.

[Fig. 2A]

FIG. 5 shows a write operation for one track and a second subsequent write operation for the same track using a dual element recording head with read wide / write narrow architecture.

[Fig. 2B]

FIG. 5 shows a write operation for one track and a second subsequent write operation for the same track using a dual element recording head with read wide / write narrow architecture.

[Fig. 2C]

FIG. 5 shows a write operation for one track and a second subsequent write operation for the same track using a dual element recording head with read wide / write narrow architecture.

[Fig. 3]

It is a perspective view from the side of the cross section of the writing element of the medium with the pane and the dual element recording head of the read wide / writing narrow.

[Fig. 4]

A side view of the cross section of the paneed medium showing the components that make up the paneed medium (a) and the paneed medium, as well as the read and write elements of the dual element recording head. It is the top view (b) which shows the relationship of the medium with a pane with respect to.

[Fig. 5]

It is a perspective view from the side of the cross section of the medium with a pane containing the day island in the day track.

[Fig. 6]

A top view (a) showing a magnetic recording medium consisting of a land for storing data and a trough having steps for storing sir information, and a side view (b) of a cross section of the magnetic recording medium. Is.

[Fig. 7]

FIG. 5 is a block diagram showing a magnetic recording system including a magnetic recording medium in which sir information is written in a trough of a medium with a pane.

[Explanation of symbols]

16, 80 recording head 18 This? 20, 22, 24 Trat? 26 Read element 28 Write element 70a, 70b, 70c land 72 Media with pane 74a, 74b, 114a, 114b, 114c, 114d, 102 trough 76 board 78? Lee layer 82 Read element 84 Write element 100 Day Island 116 floors 118 steps 120 recording head 122 Preamplifier 124 Low frequency fill? 126 High frequency fill?