Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1997-01-24
1999-11-30
Cabeca, John W.
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
360 53, 360 54, G11B 2736
Patent
active
059953063
ABSTRACT:
Method and apparatus are provided for re-recording of a frame on magnetic tape (22) when a first recording of the frame is determined to be defective. A frame whose first recording is defective is re-recorded at a spare or reserved location on the tape. The reserved location is dedicated to re-recording of frames, and otherwise cannot have data stored therein. The tape contains a defect map frame (326) which is used to pair physical locations of defective frames with the reserved location whereat the frame is re-recorded. In one embodiment, the reserved location whereat a frame is re-recorded is a reserved physical frame on the same track in which the defective frame is recorded. In another embodiment, the reserved location is on a reserved portion of a track (TG39R) which is not the original track (TG39) upon which the frame is recorded. For embodiments having multi-channel or multi-track frames, the reserved location employs a corresponding plurality of tracks.
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Ayres Mark R.
Canterbury Daniel J.
Contreras, deceased John M.
Hartung Steven F.
Cabeca John W.
Davidson Dan I.
Exabyte Corporation
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