Fujitsu MHN2300AT, MHN2150AT, MHN2100AT, MHN2200AT manual Requested data Mis-hit data Empty area

Operations

2)The disk drive transfers the requested data that is already read to the host system with reading the requested data.

HAP

Requested data

Mis-hit data Empty area

DAP

3)After completion of the reading and transferring the requested data to the host system, the disk drive performs the read-ahead operation continuously.

HAP (Completion of transferring requested data)

Requested data

Read-ahead data

Empty area

DAP

4)The disk drive performs the read-ahead operation for all area of segment with overwriting the requested data. Finally, the cache data in the buffer is as follows.

HAP

Read-ahead data

DAP

Last LBA Start LBA

b.Sequential hit

When the previously executed read command is the sequential command and the last sector address of the previous read command is sequential to the lead sector address of the received read command, the disk drive transfers the hit data in the buffer to the host system.

The disk drive performs the read-ahead operation of the new continuous data to the empty area that becomes vacant by data transfer at the same time as the disk drive starts transferring data to the host system.

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