6.5.3Usage of read segment
This subsection explains the usage of the read segment buffer at following cases.
(1)
A lead block of the
1)Sets the host address pointer (HAP) and the disk address pointer (DAP) to the sequential address to the last read segment.
HAP
Segment for read
DAP
2)Transfers the requested data that already read to the host system with reading the requested data from the disk media.
HAP
Stores the
Empty area
DAP
3)After reading the requested data and transferring the requested data to the host system had been completed, the disk drive continues to read till a certain amount of data is stored.
HAP (stopped)
Read Ahead Data
(stopped)
DAP
4)Following shows the cache enabled data for next read command.
Cache enabled data
Start LBA | Last LBA |
| 6 - 15 |