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6.4 Read-Ahead Cache
C141-E120-02EN 6-17
1) In the case that the contents of buffer is as follows at receiving a read
command;
Start LBALast LBA
DAP
HAP (Continued from the previous read request data)
Hit dataRead-ahead data
2) The disk drive starts the read-ahead operation to the empty area that becomes
vacant by data transfer at the same time as the disk drive starts transferring
hit data.
DAP
HAP
Hit dataNew read-ahead dataRead-ahead data
3) After completion of data transfer of hit data, the disk drive performs the read-
ahead operation for the data area of which the disk drive transferred hit data.
Read-ahead data
HAP
DAP