Fujitsu MHA2021AT Product Manual page 161

Operations
4) Finally, the cache data in the buffer is as follows.
Start LBA
(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.
Last position at previous read command
HAP
Cache data
2) The disk drive transfers the requested data but does not perform the read-
ahead operation.
Cache data
3) The cache data for next read command is as follows.
Start LBA
6-20
Read-ahead data
HAP (set to hit position for data transfer)
Full hit data
Last position at previous read command
Full hit data
Cache data
Last LBA
Cache data
DAP
HAP
(stopped)
Cache data
Last LBA
C141-E042-01EN