Modern plattern hard drives are so fine that there will no data left after a 1 pass erasure.
Older drives had "deeper grooves" to store the data in. It could happen that after a single pass erasure some traces of data was left on the sides of the grooves. Only with a multiple pass erasure this was securely removed.
You can set the wipe to a single pass, we advise the NIST standard. If you add a full verification this will be the most secure way to wipe a drive.
For Flash storage, like SSD's, we always advise to wipe with the SSD smart wipe pattern. However the NIST Single pass can also be used to wipe Flash storage. Make sure the secure erasure options are turned.
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.