| 摘要 |
According to one embodiment, a storage device manages a user data area by dividing the area into a plurality of division data areas. The storage device includes a storage module, an access authority setting module, a lock processor, a command receiver, and an unlock processor. The storage module includes the division data areas. The access authority setting module sets access authority with respect to each division data area for each user. The lock processor disables access to the storage module from a host device that reads data from and writes data to the storage module. The command receiver receives from the host device an unlock command including a basic area storing basic unlock information and an expansion area storing additional unlock information. The unlock processor unlocks each division data area, to which access is restricted for each user, based on the basic unlock information and the additional unlock information.
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