Methods of sanitizing a flash-based data storage device

a data storage device and flash technology, applied in the field of nonvolatile storage devices, can solve the problems of difficult sanitizing such a medium, unable to recover data, and requiring a long time (minutes to hours) to perform
US20050270843A1Inactive Publication Date: 2005-12-08SANDISK IL LTD
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
SANDISK IL LTD
Publication Date
2005-12-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

A data storage device includes one or more non-volatile, blockwise erasable data storage media and a mechanism for sanitizing the media in response to a single external stimulus or in response to a predetermined physical or logical condition. Optionally, only part of the media is sanitized, at a granularity finer than the blocks of the medium. Setting a flag in an auxiliary nonvolatile memory enables an interrupted sanitize to be detected and restarted. Optionally, a “death certificate” verifying the sanitizing is issued. Preferably, the media are configured in a manner that allows atomic operations of the sanitizing to be effected in parallel.
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Description

[0001] This is a Divisional of U.S. patent application Ser. No. 10 / 449,066 filed Jun. 2, 2003, which is a Continuation-in-part of U.S. Provisional Patent Application No. 60 / 457,021 filed Mar. 25, 2003.FIELD AND BACKGROUND OF THE INVENTION

[0002] The present invention relates to nonvolatile storage devices and, more particularly, to methods for sanitizing a flash-based data storage device and to a flash-based data storage device particularly adapted to the implementation of these methods.

[0003] For as long as data has been stored digitally, there has been a need to erase classified data, from the medium in which they are stored, in a manner that renders the data unrecoverable. Such an erasure is called “sanitizing” the medium.

[0004] The most common nonvolatile data storage devices use magnetic data storage media, in which data bits are stored as magnetized regions of a thin ferromagnetic layer. It is difficult to sanitize such a medium. The usual method of sanitizing such a medium ...

Claims

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