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Operations
6-18 C141-E042-01EN
1) At receiving the sequential read command, the disk drive sets the DAP and
HAP to the start address of the segment and reads the requested data from the
load of the segment.
Empty areaMis-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 area
3) After completion of the reading and transferring the requested data to the host
system, the disk drive performs the read-ahead operation continuously.
Requested data
DAP
HAP (Completion of transferring requested data)
Empty area
Read-ahead data
4) The disk drive performs the read-ahead operation for all area of segment with
overwriting the requested data. Finally, the cache data in the buffer is as
follows.
Start LBALast LBA
DAP
HAP
Read-ahead data
DAP
HAP