Fujitsu MPB3021AT Product Manual page 174

3) After completion of data transfer of hit data, the disk drive performs the read-ahead
operation for the data area of which the disk drive transferred hit data.
HAP
DAP
4) Finally, the cache data in the buffer is as follows.
Start LBA
c. Non-sequential read command just after sequential read command
When non-sequential read command is received after executing the sequential read
command (read-ahead operation) and more than ten non-sequential read commands are
received after that continuously, the read-ahead operation is stopped (refer to item (1)).
Processing is the same as item a. above
(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.
Read-ahead data
Read-ahead data
C141-E045-02EN
Last LBA
6 - 19