Memory device, storage method and control device

A storage method performed by a memory device, the storage method comprising:

• in a storage unit in which a plurality of semiconductor chips each comprising a plurality of memory blocks respectively arranged in a planar direction and a plurality of redundant blocks respectively arranged in the planar direction are stacked, detecting a defect of each of the memory blocks;
• checking free capacity in each of the redundant blocks in the storage unit;
• and
• determining a substitute block to be substituted for the memory block in which the defect has been detected from the redundant blocks having the free capacity,
• the defect is detected upon activation of the memory device,
• the free capacity in the redundant blocks is checked upon activation of the memory device,
• the substitute block is determined upon activation of the memory device and a table defining a correspondence relationship between the memory block at which the defect has been detected and the substitute block is created, and
• the storage unit is accessed with reference to the table.

A control device comprising:

• a storage unit in which a plurality of semiconductor chips each comprising a plurality of memory blocks respectively arranged in a planar direction and a plurality of redundant blocks respectively arranged in the planar direction are stacked;
• a detecting unit configured to detect a defect of each of the memory blocks in the storage unit;
• a checking unit configured to check free capacity in each of the redundant blocks in the storage unit;
• a determining unit configured to determine a substitute block to be substituted for the memory block in which the defect has been detected from the redundant blocks having the free capacity;
• and
• a control unit configured to access the storage unit,
• the detecting unit detects the defect upon activation of the memory device,
• the checking unit checks the free capacity in the redundant blocks upon activation of the memory device,
• the determining unit determines the substitute block upon activation of the memory device and creates a table defining a correspondence relationship between the memory block in which the defect has been detected and the substitute block, and
• the control unit accesses the storage unit with reference to the table.