Command f (Free disk space fill (=reliability test) or wipe (privacy))

This command will fill, or wipe, 99% of the free disk space in 500MB chunks

Check if disk-controller-system-RAM-cache-cables are working fine

Beware: wear for cheap SSDs/USB sticks

• : -verbose Show write speed (useful to check speed consistency)
• : -force Do NOT delete (after run) the temporary filename. By default free
• : -zero Zero-fill instead of random. Use to prepare a thin VMDK shrink
• : -verify For -zero: do a verify.
  Examples:

Fill (wipe) almost all free space with pseudorandom files

zpaqfranz f z:\

Fill (wipe) keep temp files (you have to remove yourself)

zpaqfranz f z:\ -force -verbose

Zero free space (good for VM shrink or sector-level image)

zpaqfranz f z:\ -zero

Zero free space (WITH verify)

zpaqfranz f z:\ -zero -verify