The access control device comprises a first interface (IF) which receives access requests from a host device, and a second IF which respectively accesses one or a plurality of access destination candidates in an external device. The second IF attempts to access a particular access destination candidate if the first IF has received an access request, and outputs a judgment result indicating that a recovery has been performed if it is determined that a recovery has been performed after the access attempt has failed. The first IF detects whether there has been a recovery in the access path to the particular access destination candidate by referring to the judgment result output by the second IF.

 
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< Power off controllers and memory storage apparatus including a power-polling time control circuit

> Method and computer program product of keeping configuration data history using duplicated ring buffers

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