Patent
1996-12-11
1998-02-03
Chan, Eddie P.
395470, 395471, 39518222, G06F 1200
Patent
active
057154244
ABSTRACT:
An apparatus and method are provided for amortizing the adverse performance impact of an erase-write-verify process for rewritable optical disks, with its numerous delays, over multiple sectors. A block of data to be written to a sector on a particular track of the disk is transferred from the host to a cache storage device. When a predetermined number of blocks to be written to the track have accumulated in the cache, destaging will occur. Those sectors to which the blocks will be written are erased in a single pass. Then the blocks are written to the erased sectors in the next pass. Verification of the written data, if desired, can be performed in a third pass. Consequently, only two passes per track (or three, if verification is desired) are required to record data from the host to the disk instead of two passes (or three) per block using conventional methods and the seek and latency delays are also reduced. Multiple tracks can be destaged in an order established by a controller. Immediate destaging can occur if an event occurs requiring destaging which would otherwise jeopardize the integrity of the blocks of data retained in the cache.
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Jesionowski Leonard George
Kulakowski John Edward
Means Rodney Jerome
Bragdon Reginald G.
Chan Eddie P.
International Business Machines - Corporation
Sullivan R. M.
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