Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data recirculation
Patent
1991-03-15
1992-08-25
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data recirculation
360 53, 360 64, G11B 509, G11B 1514
Patent
active
051424223
ABSTRACT:
A dual channel helical scan recording system (30) includes a rotating dum (36) having sets of heads (W1, W2) (R1, R2) mounted on its peripheral surface (56). A set of write heads (W1, W2) is situated on an opposite side of the drum (36) from a set of read heads (R1, R2). The write heads (W1, W2) simultaneously write two adjaent tracks (T1, T2), which are read for verification 180 detrees later by corresponding read heads (R1, R2). The heads (W1, W2, R1, R2) are strategically mounted on the drum (36) with respect to angular and axial placement, and have selected head widths and azimuthal angles. Should a block of data (317) written to tape (32) be determined, during readback, to be bad block, that bad block is subsequently rewritten on the tape (32) in the course of writing good blocks and amongst other good blocks. The rewritten block is recorded at a row position on the tape which is sufficiently displaced from the row position of a previous writing to avoid media defects occuring on the tape. In addition, a block written by a first write head (W1) and perceived as having been written as a bad block must be written by a second write head (W2) before that block is rewritten a predetermined number of times.
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Atai-Azimi Alireza
Bordasch Robert
Georgis Steven P.
Haughland Steve E.
Hughes Timothy C.
Exabyte Corporation
Psitos Aristotelis
Sheladia Varsha V.
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