Managing data storage space on large capacity record media

G - Physics – 11 – B

Patent

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352/13, 354/237

G11B 20/12 (2006.01) G06F 3/06 (2006.01) G11B 7/24 (2006.01) G11B 13/04 (2006.01)

Patent

CA 1314100

ABSTRACT OF THE DISCLOSURE 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 indica- tions 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.

584969

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