| 摘要 |
According to one embodiment, an information storage device includes a non-volatile storage medium, a non-volatile memory configured to store specific data blocks to be read for a host device and write data to be written to the non-volatile storage medium, a buffer configured to temporarily store write data transmitted from the host device, and a controller. The controller is configured to delete synchronized data the same data block as which exists on the non-volatile storage medium among the specific data blocks stored in the non-volatile memory if the free space of the non-volatile memory is smaller than a given data size, and to write the write data stored in the buffer to the non-volatile memory.
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