Patent attributes
According to one embodiment, a memory system includes a non-volatile memory with a plurality of blocks. The minimum unit of a data erasing operation in the memory system is a block. A controller is electrically connected to the non-volatile memory and configured to execute, in response to a first command from a host requesting a secure erase of secure erase target data stored in a first logical area identified by a first logical area identifier, a copy operation copying valid data other than any secure erase target data from one or more first blocks of the plurality in which the secure erase target data is stored to one or more copy destination blocks of the plurality. The controller executes the data erasing operation on the one or more first blocks after the copy operation.
