Magnetic data storage disk drive with data block sequencing by using ID fields after embedded servo sectors
US5475540A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 19, 1993 |
| Grant date | Dec 12, 1995 |
| Priority date | — |
| Expiry date | Oct 19, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2508
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic data storage disk record carries a pattern of magnetic domains defining a plurality of concentric data tracks divided into data sectors by embedded servo sectors recorded at a predetermined constant frequency and containing head positioning information for positioning a data transducer head for reading the disk track. Each data sector is recorded at a data transfer rate selected in relation to displacement of the track from a center of the disk. Each data sector defines a plurality of variable length data segments which are combined to provide a fixed length user data block. In order to avoid a write-to-read transition and Barkhausen noise, each data sector begins with an ID header immediately following a servo sector. The ID header includes a plurality of count byte fields for providing a count of bytes of each one of the user data segments within the data sector, and a flag field for indicating whether the user data block begins at the first data block segment of the particular data sector. A disk drive data sequencer using the count bytes and flag bytes is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.