Fujitsu MHN2200AT, MHN2150AT, MHN2100AT, MHN2300AT Read-ahead data New read-ahead data Hit data

6.4 Read-Ahead Cache

1)In the case that the contents of buffer is as follows at receiving a read command;

HAP (Continued from the previous read request data)

Read-ahead data Hit data

DAP

Last LBA Start LBA

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.

HAP

Read-ahead data New read-ahead data

Hit data

DAP

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.

HAP

Read-ahead data

DAP

C141-E120-02EN 6-17