Patent ID: 9367444
Filing Date: 2016-06-14
CPC Classification: G06F

Claim Text:
1. A storage device for a host device, comprising: a non-volatile semiconductor memory; a mapping table having a first mapping of a first logical address, wherein the first mapping of the first logical address is to a first physical address of the nonvolatile semiconductor memory; an invalid data table having second and third mappings of the first logical address, wherein the second mapping of the first logical address is to a second physical address of the nonvolatile semiconductor memory and the third mapping of the first logical address is to a third physical address of the nonvolatile semiconductor memory; a control section configured to execute a delete process in response to a request to delete data stored at the first logical address from the host device, the delete process including determining from the mapping table the first physical address to which the first logical address is mapped and from the invalid data table, the second and third physical addresses to which the first logical address is mapped, and electrically erasing or electrically overwriting data stored in the non-volatile semiconductor memory at the first, second, and third physical addresses.