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