| 摘要 |
According to one embodiment, a disk drive device includes a head, a register which stores various commands which are transmitted from the host device, a read/write process unit which executes a read/write control process including a write operation or a read operation, a cache memory which stores write data that is transmitted from the host device and read data that is read out of a disk medium, and a control unit which executes an unload operation of retreating the head to a retreat position that is located outside the disk medium in a case where an unload command is written in the register by the host device during execution of the read/write control process, and controls data transfer between the cache memory and the host device in accordance with the read command or the write command, thereby to continuously execute the read/write control process.
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