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The Approach of Fast Logic Data Destruction for Military SSD

Quick Erase which means full disk logic destruction in a few seconds to get all data in the SSD unreadable is critical in some specific environments of military applications.

Generally, there are following different requirements for Quick Erase, and the implementation methods by SSD firmware are different:
1. After the Quick Erase, the disk remains visible in OS and reusable after initialization, just all data are read as 0xFF by Winhex.

For this type of Quick Erase, the firmware normally erases AES Encryption Key first and then resumes the mapping table to factory defaults. Erasing Encryption Key is to ensure the data can’t be correctly restored, and resuming the mapping table to factory defaults destructs the mapping connections between physical and logical addresses so that the data in the SSD can’t be correctly read.

Notes have to be taken for such Quick Erase:

If the SSD receives program commands again or there is data in SDRAM hasn’t been written into NAND Flash during executing the Quick Erase, the data writes into the SSD would be continued after Quick Erase, then not all data are read as 0xFF with Winhex.

Two solutions for this: One is wiping the data in SDRAM before executing data destruction to avoid the data in SDRAM being written into NAND Flash after the erase. Another solution is enable the Write Protect function when executing data destruction until power on next time, this prevents the writing command received after executing data destruction from continuing the data
writes into SSD.

2. After Quick Erase, the SSD is invisible in OS and of course the status of the data inside can’t be checked by software.

This can be operated under the following order:

Wipe the mapping table after erasing the encryption key, and then destruct the firmware, in such case, the SSD can only work again after returning to factory for re-implanting firmware.

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