Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data in specific format
Patent
1990-04-04
1992-07-21
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data in specific format
360 66, 369 59, G11B 509
Patent
active
051328534
ABSTRACT:
A large capacity data storing disk includes a volume table of contents (VTOC) which identifies allocated ones of data storage tracks and identification of the data contents therein, indications of unallocated data storage track and an indication of which of the data storage tracks on the large capacity disk surface are unformatted. The indications may also include indications of unallocated "erased" tracks that do not contain data residuals from previous recordings. Those unallocated tracks having such erased condition in a count key data record format (CKD) require a home address record on each of the formatted tracks. The home address record may include indications of rotational position of defects to be skipped over during the recording and readback operations. A specific embodiment of the invention using a magnetooptic record medium is described.
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Kulakowski John E.
Means Rodney J.
Canney Vincent P.
International Business Machines - Corporation
Somermeyer H. F.
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