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C141-E056-02EN6 - 20
2) The disk drive transfers the requested data but does not perform the read-ahead operation.
(stopped)
HAP
Cache dataFull hit dataCache data
3) The cache data for next read command is as follows.
Cache data
(4) Partially hit
A part of requested data including a lead sector are stored in the data buffer. The disk drive
starts the data transfer from the address of the hit data corresponding to the lead sector of the
requested data, and reads remaining requested data from the disk media directly.
Following is an example of partially hit to the cache data.
Last LBA
Cache data
1) The disk drive sets the HAP to the address where the partially hit data is stored, and sets
the DAP to the address just after the partially hit data.
HAP
DAP
Partially hit data Lack data
Last LBA
Start LBA
Start LBA