The verification process happens after the last erasure pass is done writing, unless the method otherwise states. It will check the hard drive if all* sectors have the correct data** in it.
The software will overwrite all old data but this has to be confirmed. Therefor there is a verification process. NIST guidelines advise at least 25% verification. But how higher the verification is set the more secure the erasure is done. We will advise 100% verification.
You can fail the process if a dirty/bad sector and/or errors are found.
*= you can set the amount of sectors that need to be checked from 2% to 100%.
We advise to go for 100% to be full secure. If you need more information on the verification levels please contact us.
**= the correct data is the data that has to be written to the hard drive as set to that specific pattern.
If you need more information, please contact us via one of below options.
Our official support hours are 8:00 am to 16:30 pm, after those hours emailing us or submitting a ticket would be the best option.