Data Sanitization on eMMCs

Data sanitization of modern digital devices is an important issue given that electronic wastes are being recycled and repurposed. The embedded Multi Media Card (eMMC), one of the NAND flash memory-based commodity devices, is one of the popularly recycled products in the current recycling ecosystem. We analyze a repurposed devices and evaluate its sanitization practice. Data from the formerly used device can still be recovered, which may lead to an unintentional leakage of sensitive data such as personally identifiable information (PII). Since the internal storage of an eMMC is the NAND flash memory, sanitization practice of the NAND flash memory-based systems should apply to the eMMC. However, proper sanitize operation is obviously not always performed in the current recycling ecosystem. We discuss how data stored in eMMC and other flash memory-based devices need to be deleted in order to avoid the potential data leakage. We also review the NAND flash memory data sanitization schemes and discuss how they should be applied in eMMCs.