Sector servo data recording disk having data regions without identification (ID) fields
AssigneeInternational Business Machines Corporation
InventorsJohn S. Best, Steven R. Hetzler
Life of this patent
Estimating the term…
Abstract
A data recording disk file with a fixed block architecture sector format that eliminates the ID region. The servo region contains sector identification information in the form of a start-of-track indicating mark recorded in a selected sector of each track and a start-of-sector indicating mark recorded in each sector. A full track number identifier is encoded in the position field within the servo region of each sector. A look-up table is built at format time to map bad sectors out of the disk file. The table contains entries for each cluster of contiguous bad sectors, and is searched at runtime to provide conversion of logical sector location identifiers to physical sector location identifiers.
Claims15
A data recording disk having a pattern of radially spaced tracks and a plurality of circumferentially spaced angular sectors having prerecorded servo positioning information for identifying track and sector locations, each of the plurality of sectors including only a data region for recording user data and, preceding the data region in the circumferential direction, a servo-and-recovery region which provides the prerecorded servo positioning information to uniquely identify the sector and track, wherein the servo-and-recovery region includes a write-to-read-recovery and speed-compensation field, an error handling field, a position-error-signal field, a start-of-sector indicating mark, and a track number field, but no data region identification (ID) field, wherein the data region includes, in sequence, a read-to-write-recovery and speed-compensation field and a synchronization field, and wherein one of the plurality of sectors also includes a start-of-track indicating mark.
A data recording disk having a plurality of tracks, each of the plurality of tracks having a start-of-track indicating mark and being divided into a number of data regions for recording user data and a number of servo-and-recovery regions, the servo-and-recovery regions containing a position-error-signal field, a servo-and-recovery region count mark, and a track number field, at least one of the data regions being split by a servo-and-recovery region, and wherein none of the plurality of tracks have, either within or outside the data regions and servo-and-recovery regions, identification (ID) regions containing information that uniquely identifies the data regions in the tracks.
Dependencies are inferred from the claim text.