Transducer head skew arrangement for disk drive system
Abstract
A transducer head skew arrangement used in a multiple disk drive data storage system is provided. The disk drive unit includes a plurality of magnetic disk surfaces mounted for simultaneous rotation about an axis. A first sequence of servo information tracks are arrayed on a dedicated servo disk surface. At least one servo reference track is written on each data disk surface for storing servo reference information. The servo reference track (RO) is written on a first data disk (18) surface aligned with a predefined servo information track (22) on the dedicated servo disk (20) surface. Then servo reference tracks (R1-R13) are sequentially written on each successive consecutive data disk (18) surface progressively offset radially from the last written servo reference track. A plurality of data information tracks for storing data are disposed at predetermined positions relative to the servo reference track on each the data disk surface. A servo transducer head is mounted for movement in a radial direction across the first dedicated servo information for reading servo information ; and a plurality of data transducer heads are mounted for movement with the servo transducer head in a radial direction across the disk surfaces for reading the servo reference tracks and for reading and/or writing data to the data information tracks. The distance moved by transducer heads for a cylinder switch is the same distance moved for each head switch, so that track-to-track seek time is minimized without requiring any additional time delay for each head switch. An overall data transfer rate increases for every data transfer accessing more than one data cylinder.

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Projected expiry passed 29 August 2011, 15.1 years ago.
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1 sheet
Sheet 1
Every citation, both ways
| Document | Relation | Office | Category | Cited during |
|---|---|---|---|---|
| EP0233606A2 | Cites | European Patent Office (EPO) | A | Search report |
| EP0267771A2 | Cites | European Patent Office (EPO) | A | Search report |
| EP0319803A2 | Cites | European Patent Office (EPO) | A | Search report |
| DE2629473A1 | Cites | Germany | A | Search report |
| US4371960A | Cites | United States of America | A | Search report |
17 members in 10 offices
Priority claims4
| Document | Office | Kind | Date |
|---|---|---|---|
| 591910 | United States of America | – | |
| 59191090 | United States of America | A | |
| 59191090 | United States of America | A | |
| US19900591910 | – | – | – |
Members17
| Document | Office | Kind | |
|---|---|---|---|
| CA2050152A1 | Canada | A1 | |
| EP0479701A2 | European Patent Office (EPO) | A2 | |
| CN1060549A | China | A | |
| KR920008706A | Republic of Korea | A | |
| EP0479701A3This record | European Patent Office (EPO) | A3 | |
| US5193036A | United States of America | A | |
| CN1022869C | China | C | |
| JPH06318315A | Japan | A | |
| MY107191A | Malaysia | A | |
| KR960001252B1 | Republic of Korea | B1 | |
| EP0479701B1 | European Patent Office (EPO) | B1 | |
| DE69118803D1 | Germany | D1 | |
| CA2050152C | Canada | C | |
| DE69118803T2 | Germany | T2 | |
| JP2553263B2 | Japan | B2 | |
| HK202696A | Hong Kong, China | A | |
| SG46503A1 | Singapore | A1 |
26 legal events, as 3 offices reported them to INPADOC
Over the term
Point at a mark for the eventEvents
| Event | Code | Office | |
|---|---|---|---|
| Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25 | PG25 | EP | |
| Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25 | PG25 | EP | |
| Gb: european patent ceased through non-payment of renewal feeCeasedGBPC | GBPC | EP | |
| Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP | PGFP | EP | |
| Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP | PGFP | EP | |
| Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25 | PG25 | EP | |
| Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)732E | 732E | GB | |
| European patent in force as of 2002-01-01IF02 | IF02 | GB | |
| Notification of lapseLapsedST | ST | FR | |
| Lapsed in a contracting state [announced via postgrant information from national office to epo]LapsedPG25 | PG25 | EP | |
| No opposition filedOpposition26N | 26N | EP | |
| No opposition filed within time limitOppositionORIGINAL CODE: 0009261PLBE | PLBE | EP | |
| Information on the status of an ep patent application or granted ep patentGrantedSTATUS: NO OPPOSITION FILED WITHIN TIME LIMITSTAA | STAA | EP | |
| Fr: translation filedET | ET | EP | |
| Annual fee paid to national office [announced via postgrant information from national office to epo]GrantedPGFP | PGFP | EP | |
| It: translation for a ep patent filedITF | ITF | EP | |
| It: translation for a ep patent filedITF | ITF | EP | |
| Corresponds to:REF | REF | EP | |
| Designated contracting statesAK | AK | EP | |
| (expected) grantORIGINAL CODE: 0009210GRAA | GRAA | EP | |
| First examination report despatched17Q | 17Q | EP | |
| Designated contracting statesAK | AK | EP | |
| Search report despatchedORIGINAL CODE: 0009013PUAL | PUAL | EP | |
| Request for examination filed17P | 17P | EP | |
| Designated contracting statesAK | AK | EP | |
| Public reference made under article 153(3) epc to a published international application that has entered the european phaseORIGINAL CODE: 0009012PUAI | PUAI | EP |
Numbers
- Publication
- 0479701
- Publication, DOCDB
- 0479701
- Publication, EPODOC
- EP0479701
- Application
- 480133
- Application, DOCDB
- 91480133
- Application, EPODOC
- EP19910480133
Titles3
- German
- Anordnnung zur Spurverfolging durch den Wandlerknopf in einem Plattenspeichersystem
- English
- Transducer head skew arrangement for disk drive system
- French
- Arrangement pour suivi de piste par un transducteur à tête dans un système de mémoire à disques
Classification
- CPC, 4
- G11B19/20
- G11B5/596
- G11B19/02
- G11B21/083
- IPC, 6
- G11B5 48
- G11B19 02
- G11B19 20
- G11B20 12
- G11B21 08
- G11B21 10
Designated states1
- Contracting states, 1
- Italy