HP LaserJet, OfficeJet, PageWide, ScanJet - HP FutureSmart Firmware Device Hard Disk, SSD, and eMMC Security (white paper)

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Secure Sanitizing Erase mode follows the U.S. Department of Defense 5220-22.M specification using a
succession of multiple data overwrites.
For Secure Sanitizing Erase, each deleted file is overwritten with:
 the fixed character pattern (binary 01001000).
 the complement of the fixed character pattern (binary 10110111).
 a random character:
o A 32k byte buffer of random characters is generated for each file delete operation using the
device’s unique uptime as the seed.
o Each byte of file data uses a unique random character from the buffer.
o The random character buffer is reused up to 32 times, and then regenerated using new random
data.
To ensure successful completion of each overwrite operation, each overwritten byte is verified.
Note: NIST SP-800-88 “Guidelines for Media Sanitization” (R1 December 2014) supersedes the US DOD 5220-
2.M (1997 edition) specification.