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The minimum verification corresponds to checking 1% of the surface of the drive (fast process), while the full verification corresponds to checking 100% of the surface of the drive (slower process). There is an exception though: the NIST standards “NIST 800-88 Purge” and “NIST 800-88 Clear” always perform by design a verification of at least 10% of the surface of the drive.

Taking samples across the drive's surface can efficiently detect any problems in the erasure, while being faster than reading all the overwritten data. Blancco Driver Eraser user can increase the level of verification from the default 1% all the way up to 100% (full verification) when higher level of security is required. If the verification finds any data left on the drive (overwriting patterns are missing), it will alert the user that the erasure process has failed.