Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data verification
Patent
1997-06-04
1998-10-06
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data verification
360 48, 360 49, 360 51, 360 7708, G11B 509, G11B 5596
Patent
active
058186549
ABSTRACT:
A memory medium has a plurality of tracks arranged in a plurality of sectors with each track sector having a format which does not include header fields identifying sectors or sector defects or defect management procedures. Track management apparatus identifies the track sector currently confronting a transducer; the track management being based on sector pulses (in the case of a dedicated servo system), or being calculated based on track information, an index pulse and data wedge information from previous wedges (in the case of embedded servo systems), or being derived from a lookup table. To accommodate sector defects, a defect bank contains the identity and type of each defective or spare sector. Defect management apparatus is connected to the defect bank and track management apparatus to indicate when the sector confronting the transducer is a defective or spare sector to halt data transfer to thereby skip the defective sector, or to generate an interrupt signal to the processor to transfer data between the processor and an alternate sector.
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"21/2-inch 270, 344, 405, 540 and 810MB Disk Drives", IBM Fast Fax #1053, May 1994.
Atsatt Sean R.
Gates Timothy V.
Groo Mark H.
Reddy Prafulla B.
Shaver Jimmie R.
Neal Regina Y.
Psitos Aristotelis M.
Seagate Technology Inc.
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