A method for securely erasing a nonvolatile semiconductor mass storage, computer system and computer program product

摘要

Method (V) for safely erasing a nonvolatile semiconductor mass memory (HMS) having a plurality of physical memory units that are connected either to a first memory area (SB1) that can be addressed via an interface (SS) of the semiconductor mass memory (HMS) or via the interface ( SS) associated with non-addressable second memory area (SB2), and a controller (CNT) adapted to receive, upon receipt of a command to overwrite memory units associated with the first memory area (SB1) via the interface (SS) to change to the first memory area (SB1) and the second memory area (SB2) according to an algorithm for producing a wear compensation, comprising the steps of: - marking the entire addressable first memory area (SB1) for erasure, the first memory area (SB1) having a metafile-less File system is formatted; sending a release note ls from an operating system or BIOS via the interface (SS) to the controller (CNT); - releasing the physical storage units associated with the first storage area (SB1) for writing by the controller (CNT) upon receipt of the release command; - sending at least a first one Write command from the operating system or BIOS via the interface (SS) to the controller (CNT) for writing the entire first memory area (SB1) to data blocks having a predetermined first bit pattern, overwriting the entire first memory area (SB1) with the first bit pattern ; and - transmitting at least one second write command from the operating system or BIOS via the interface (SS) to the controller (CNT) for overwriting at least a predetermined portion of the previously written data blocks with a second different bit pattern from the first one, according to the algorithm for Produce a wear compensation the second memory area (SB2) associated physical storage units are described.