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4) Finally, the cache data in the buffer is as follows.
Read-ahead data
(3) Full hit (hit all)
All requested data are stored in the data buffer. The disk drive starts transferring
the requested data from the address of which the requested data is stored. After
completion of command, a previously existed cache data before the full hit
reading are still kept in the buffer, and the disk drive does not perform the read-
ahead operation.
1) In the case that the contents of the data buffer is as follows for example and
the previous command is a sequential read command, the disk drive sets the
HAP to the address of which the hit data is stored.
HAP (set to hit position for data transfer)
Last position at previous read command
Last position at previous read command
Cache dataFull hit dataCache data
2) The disk drive transfers the requested data but does not perform the read-
ahead operation.
(stopped)
HAP
Cache dataFull hit dataCache data
3) The cache data for next read command is as follows.
Cache data
HAP
DAP
Last LBAStart LBA
Last LBAStart LBA