FUJITSU MPC3065AH User Manual
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C141-E056-02EN
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Sequential read
When the disk drive receives the read command that targets the sequential address to the
previous read command, the disk drive tries to fill the whole of buffer space with the read
ahead data.
a. Sequential command just after non-sequential command
1)
At receiving the sequential read command, the disk drive sets the DAP and HAP to
the sequential address of the last read command and reads the requested data.
Empty data
Mis-hit data
2)
The disk drive transfers the requested data that is already read to the host system with
reading the requested data.
Requested data
DAP
HAP
Mis-hit data
Empty data
3)
After completion of the reading and transferring the requested data to the host system,
the disk drive performs the read-ahead operation continuously.
Mis-hit data
Requested data
DAP
HAP
Empty
data
Read-
ahead
data
DAP
HAP