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Semiconductor NAND Flash based memory technology dominates the electronicNon-Volatile storage media market. Though NAND Flash offers superiorperformance and reliability over conventional magnetic HDDs, yet it suffersfrom certain data-security vulnerabilities. Such vulnerabilities can exposesensitive information stored on the media to security risks. It is thusnecessary to study in detail the fundamental reasons behind data-securityvulnerabilities of NAND Flash for use in critical applications. In this paper,the problem of unreliable data-deletion/sanitization in commercial NAND Flashmedia is investigated along with the fundamental reasons leading to suchvulnerabilities. Exhaustive software based data recovery experiments (multipleiterations) has been carried out on commercial NAND Flash storage media (8 GBand 16 GB) for different types of filesystems (NTFS and FAT) and OS specificdelete/Erase instructions. 100 % data recovery is obtained for windows andlinux based delete/Erase commands. Inverse effect of performance enhancementtechniques like wear levelling, bad block management etc. is also observed withthe help of software based recovery experiments.

Investigation of Data Deletion Vulnerabilities in NAND Flash Memory Based Storage