Review of NAND Flash Information Erasure Based on Overwrite Technology

The lack or incorrect implementation of storage device privacy and secret-related information erasure methods will cause serious security risks for personal privacy and national construction security. Although information erasure based on overwrite for magnetic storage media is relatively mature, it is difficult for these mature technologies to be directly used in the currently widely used NAND flash memory due to its complex structure and other reasons, and its security is in doubt. The recycling industry of waste electronic equipment, mainly smart phones, is facing the problem of lack of information security clearance. In addition to the hidden dangers of information security, this situation also leads to the low recovery rate of waste electronic equipment, which leads to potential waste of resources and environmental pollution. In view of the above problems, this article reviews the information erasure for NAND flash based on the overwrite technology to support the in-depth research of the information erasure technology. At first, it introduces the definition and classification of information erasure. Then, the characteristics of NAND flash memory is analyzed. Thirdly, it summarizes the information erasure technology based on overwriting. And the research difficulties and application difficulties of information erasure technology for NAND flash memory is discussed and analyzed. Finally, conclusions and prospect the future research direction of overwrite-based information erasure technology for NAND flash are given out.