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Clear vs Purge

The differences between Clear and Purge

Clear (standard)

WipeOS implements the Clear requirements with the NIST SP 800-88r1 wipe option. This wipe option performs a single 'write' pass by filling the disk with binary zeros, then does a 10% sampling read pass which verifies that 10% of randomly sampled blocks on the disk are filled with zeros.

Purge (advanced)

Purge performs Secure Erase on ATA drives that support Secure Erase. While Clear works by writing to the logical sectors of the drive, with the hope that by doing so will also write to all physical sectors of the drive, Purge on the other hand write directly erase data in all physical sectors of the drive. Moreover, for SSDs, Purge is extremely fast, taking around a couple of minutes even for drives that are Terabytes in size.