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I've been experimenting with the latest Parted Magic Secure Erase to wipe HDDs and SSDs. After the Secure Erase completes, I noticed in the logs that the verification level is 10%. Excerpt from the log:

WDC_WD5000AZLX-00JKKA0 (/dev/sda) SERIAL NUMBER: WD-WCC6Z0JJVNY0 SIZE:465.8G RESULTS:Successfully Erased

Secure Erase Method: Normal Secure Erase

Verification Level 10%

Does this mean that Secure Erase is only sampling 10% of the drive to verify that the drive has been erased? One of our customers asked us if it's possible for Secure Erase to perform a 100% verification. Probably overkill, but given the sensitive nature of our customer's environment, I can understand their question.

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I haven't used it, but according to their documentation Using Secure Erase, the verification level can be defined.

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I don't see where it describes less than 100% as being sampled or just a chunk.

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  • Thank you, that was very helpful! Unfortunately, it looks like that Disk Verifier feature was removed from the Parted Magic version I am using (5.5.4). The link you provided was showing screenshots from version 5.2.9. Guess I can tell our customer to obtain the older version. May 8 '20 at 19:39

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