Patent ID: 7987329

Claim:
A storage system coupled to a computer via a network, comprising: a logical volume in which data is stored; and a control device which controls access to the data stored in the logical volume, wherein an area is set by using a logical block address in the logical volume, the area having a desired size and the area being defined by an identifier, wherein, upon receiving an access request made by the computer to perform shredding to the area set in the logical volume, the control device performs the shredding to the area based on the request, wherein the request to perform shredding includes an identifier of the area, wherein the request to perform shredding includes a shredding pattern to be used during shredding, wherein the control device determines whether the area overlaps with a preexisting area before the area is set, and wherein the control device determines whether an end of the preexisting area is logically preceding a beginning of the area.