FUJITSU MPB3052AT - Manual (Page 176)

C141-E045-02EN 6 - 21
1) The disk drive sets the HAP to the address where the partially hit data is stored, and sets
the DAP to the address just after the partially hit data.
HAP
DAP
Partially hit data Lack data
2) The disk drive starts transferring partially hit data and reads lack data from the disk media
at the same time. However, the disk drive does not perform the read-ahead operation
newly.
(stopped)
HAP
(stopped)
Requested data to be transferred
DAP
Partially hit data Lack data
3) The cache data for next read command is as follows.
Cache data
Last LBA Start LBA