Patent ID: 7844790

Claim:
An external storage medium device that may be accommodated in an enclosure device connected to a host side device, said external storage medium device comprising: a data holding unit holding data; a first medium management unit verifying whether or not a right for access to said data holding unit has been made, based on input authentication information; a first medium extraction detection unit detecting that the external storage medium device has been extracted from said enclosure device; an access control unit that exercises read/write control for said data holding unit responsive to a request from said host side device and inhibits data access when said first medium management unit has not received the right for access, after extraction of said data holding unit from said enclosure device, the inhibiting of data access being done before said access control unit erases data held by said data holding unit; a second medium extraction detection unit detecting extraction of the external storage medium device; and a second medium management unit announcing the fact of extraction of the external storage medium device to a predetermined host side device when the extraction of the external storage medium device has been detected by the second medium extraction detection unit, wherein the predetermined host side device performs additional security operations to physically inhibit data access to said data holding unit based on notification of the fact of extraction of the external storage medium device.