System and method for generating unique sector identifiers for an identificationless disk format
US5627695A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 12, 1995 |
| Grant date | May 6, 1997 |
| Priority date | — |
| Expiry date | Jan 12, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/1284
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for determining the position of a head with respect to a rotating magnetic disk within a disk data storage device using standard signals output from a head/drive assembly (HDA). Servo zone detect pulses are used to determine the position of the read/write head with respect to the servo cells. An index pulse determines the angular position of the head. A servo zone counter is incremented by one in response to a servo zone detect pulse. Accordingly, the servo zone counter maintains a unique value which is corresponds to each data wedge on a surface of the disk. A servo clock has a constant number of cycles between sectors. The servo clock is coupled to the clock input of a sector counter. A sector pulse is generated and the sector counter is reset to zero when the number of cycles counted indicates that the beginning of a sector is under the read/write head. A sector ID counter counts the number of sector pulses. The output of the sector ID counter is equal to the sector ID of the sector which the read/write head is currently over. Thus, the data stored in the memory allows the present invention to determine the sector ID of the sector that the read/write head …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.