Magnetic disk device

[Detailed Description of the Invention]

[Field of the Invention] The present invention relates to the magnetic disk drive which started the magnetic disk drive, especially the servo head and the data head of □ plurality unified and which passes and has - throat assembly object. [Description of the Prior Art] Drawing 1 is a schematic diagram showing an example of the magnetic disk drive by conventional technology. In the figure, 1 is a disk as a magnetic recording medium, and servo track 2 with which servo information was recorded beforehand, and data track 3 with which information is read and written are formed on the above-mentioned disk 1. The two above-mentioned data tracks 3 are formed at a time corresponding to servo track 2, and each suitcase 2.3 is separated with the Ghat band 4 which has the width of track 1 duty mostly. On the other hand, 5 is the head assembly object attached at the tip of an arm of the head positioning mechanism which is not illustrated, and the above-mentioned head assembly objects 5 are two read-only heads 5a of about two pieces of servo track 2. Name is formation of the two data heads 7 of the same width is mostly carried out to one with servo head 6 and data track 3 which comprise 6b. Each interval of servo head 6 of the above-mentioned head assembly object 5, and data head 7, It is the same as that of the width of the Ghat band 4 so that Sod 7 may be located on data track 3 to data, respectively, when located on positioning line l (here center line of servo track 2) in which servo head 6 is formed by servo track 2. Next, operation of the conventional example constituted as mentioned above is explained. For example, when information is read and written in the i-th data track 3a or the H+1st data tracks 3b, It is moved to the radial direction of disk 1 by the head positioning mechanism which is not illustrated, and head assembly object 5 is positioned so that The 6 may come on positioning line l of the j-th servo track 2a to a servo. Servo head 6 is controlled here to follow positioning line beta of the j-th servo track 2a by carrying out the feed bank of the output difference from two read-only heads 6a and 6b to a head positioning mechanism. the time of the above-mentioned servo head 6 being on positioning line beta of the j-th servo track 2a correctly -- data head 7a -- the center line top of The and i Taegu suitcase 3a -- data head 7b -- the -- it is positioned on the center line of i+l data track 3b, and information can be read and written. Drawing 2 is a schematic diagram showing other conventional examples, in this conventional example, servo head 6 comprises one read-only head, and servo tracks 2a and 2b with which the record frequency of servo information differed, or 2c and 2d adjoins, and servo track 2 is arranged. And when information is read and written by the i-th data track 3a or the i+1-, and lake suitcase 3b, for example, Positioning line beta in which servo head 6 is formed by the j-th servo track 2a and the j+1st servo tracks 2b as for head assembly object 5 (here 'la) It is moved so that it may come on the boundary line of 2b, and it is controlled to follow the above-mentioned positioning line l by feeding back the output difference of each servo track 2a and 2b with which frequency differed. It is constituted as mentioned above and the conventional magnetic disk drive is data head 7a', Since the Ghat band 4 is provided between each of each track 2.3 and Sod 6 and 7 also has a gap corresponding to it to each when 7b reads and writes information simultaneously, it has prevented the quality of the information read and written by interference of a mutual magnetic field deteriorating. However, therefore, since it is necessary to fully take the interval of each suitcase 2*3 with the Ghat band 4, it is thick in the suitcase density (TrackPer Tnch) of disk 1 (it could not carry out but had the fault that the storage capacity of a device could not be improved.). [Summary of the Invention] The present invention removes the above-mentioned fault by forming a data track corresponding to a data head, whenever it separates a positioning line formed by a servo track to a radial direction of a disk by width of a data track, it provides it in it two or more and a slowdown head corresponds to each above-mentioned positioning line. It explains in detail using an example below. [Example] Drawing 3 is a schematic diagram showing one example of the magnetic disk drive by the present invention, and it uses the same numerals for the portion the same as that of the above-mentioned conventional example, or considerable. This example shows the case where servo head 6 consists of two read-only heads 6a and 6b. Servo track 2a with which servo track 2 differed in the record frequency of servo information mutually as shown in the figure. 2b or 2c and 2d adjoins, and it is arranged, therefore it separates by the width of data track 3 by each servo track 2a and 2b or 2c and 2d, and two positioning lines Jl and A'2 are formed in the radial direction of disk 1. On the other hand, among the above-mentioned servo tracks 2b and 2c, via between, it adjoins mutually and 4 data track 3a~3d is arranged in the Ghat band 4 shown according to the conventional example. As for the above-mentioned data track 3a~3d and data heads 7a and 7b, when servo head 6 is located on positioning line ll of servo track 2a, data head 7a is on the center line of data track 3a, When data head 7b is located on the center line of data track 3C and it is located on positioning line 12 of servo track 2b, it is constituted so that it may be located on a data tracks [ 3b and 3d ] center line, respectively. Next, operation of this example constituted as mentioned above is explained. For example, when information is read and written in the i-th data track 3a or the 1+1st data tracks 3b, It is moved to the radial direction of disk 1 by the head positioning mechanism which is not illustrated, and servo head 6 of head assembly object 5 is positioning line 7 of the j-th servo track 2a! It is positioned so that it may come on ■. Here, servo head 6 is the above-mentioned positioning line ji like 1st [ The ] figure conventional example! It is controlled to follow 1, and data head 7a is positioned on the center line of the i-th data track 3a, and data head 7b is positioned on the center line of the 1+1st data tracks 3b. the case where - information is read and written in the 1+1st data tracks 3b or the 1+1st data tracks 3b -- servo head 6 -- the -- positioning line 7 of j+l servo track 2b! being positioned on two -- the above -- the same -- data head 7a. 7b -- the -- it is positioned on the center line of i+l data track 3b and the i+3rd data tracks 3d. Since record frequency differs mutually, the j-th servo track 2a and the j+1st servo tracks 2b are distinguishable. Although interference of a magnetic field poses a problem here since data track 3a~3d adjoins mutually, Positioning line beta1 *7! Other data tracks intervene between two data tracks read and written since it is a width part partition of data track 3, and interference of a magnetic field does not generate 2 and data heads 7a and 7b. In this example, by having carried out the above G Konishi device of servo track 2 and data track 3 on disk 1, the rate of data track 3 to the whole record side becomes four data tracks to two servo tracks, will adjoin mutually and will be about 67% by that of To suffer. on the other hand -- the case of 1st [ The ] figure conventional example -- watch -- since it is a data truck, two 2, and three Ghat bands to one servo track, the percentage of a data track is about 33%. Therefore, the storage capacity of the magnetic disk drive by this example becomes twice a conventional example. Although the case where - throat 6 comprised two read-only heads 5a and 6b to a servo in the above-mentioned example was shown, an example in case - throat 6 consists of one read-only head to a servo is shown in Drawing 4. In this example, they are three servo tracks 2i, 2b, and 2C, or 2d and 2e. They are two positioning lines j on the boundary line of the adjoining servo track with which 2 f adjoined mutually, and has been arranged, and the record frequency of servo information differed! 1.beta2 is formed. And data track 3a~3d of above-mentioned servo track 2 * and four G This between 2 d adjoins mutually, and is arranged. And other composition and operations become being the same as that of the above-mentioned example. In the above-mentioned example, since it is arranged as servo track 2 and data track 3 show in Drawing 4, to three servo tracks, the rate of data track 3 to the whole record side will become four data tracks, and will be about 57%. On the other hand, since it is two data tracks and three Ghat bands to two servo tracks in the case of 2nd [ The ] figure conventional example, the percentage of a data track is 29%. Therefore, in the above-mentioned example, the storage capacity of a device becomes the same twice a conventional example. Although - throat 7 explained two things to data in each above-mentioned example, it is business (z The is also good.) three or more pieces. An example in case the number of data heads 7 is three is shown in Drawings 5 and 6. One more adjoins servo track 2 here, and they are three positioning umbrella lines j! 1. j! 2. j! 3 is formed. As for data heads 7a, 7b, and 7c, width partition Composed of of the suitcase 2 duty is carried out mutually. Therefore, the rate of a data track will be about 69% in the example shown in Drawing 6 75% in the example shown in Drawing 5. Thus, the storage capacity of a device can be made into more than twice a conventional example by using three or more data heads 7. To data, Sod 7 may be on servo head 60 both sides, as shown in Drawings 7 and 8. In each above-mentioned example, although the servo information on two servo tracks which adjoin mutually was recorded on different frequency and the flattery method of the servo track which feeds back the output difference to a head positioning mechanism was shown, they may be other recording methods or flattery methods. [Effect of the Invention] As explained above, according to the magnetic disk drive by the present invention, the positioning line formed by a servo track is separated to the radial direction of a disk by the width of a data track, and is provided in it two or more, Whenever a servo head corresponds to each above-mentioned positioning line, since suitcase density of a disk can be enlarged, without being subject to the influence of interference of a magnetic field, it is effective in the ability to raise the storage capacity of a device by having formed the data track corresponding to a data head.

[Brief Description of the Drawings]

The schematic diagram and Drawings 7 and 8 showing the example of the magnetic disk drive according [ respectively the schematic diagram and Drawings 3 or 6 in which Drawings 1 and 2 show the conventional example of a magnetic disk drive ] to the present invention are a schematic diagram showing other examples of a head assembly object, respectively. 1 ... disk, 2 ... servo track, 3 ... data track, 5 ... head assembly object, 6 ... servo head, 7 ... a data head and beta ... Positioning line. The same numerals are used for the portion same in the inside of a figure, or considerable.