From Windows 8 Microsoft snuck in a refinement to the
format command. It is now possible to get it to do multi-pass random-number disk wipes. From the help (Win 10 20H2):
/P:count Zero every sector on the volume. After that, the volume will be overwritten "count" times using a different random number each time. If "count" is zero, no additional overwrites are made after zeroing every sector. This switch is ignored when /Q is specified.
So to do a single-pass random wipe:
- Repartition disk with one partition (if desired) and give it a drive letter (let’s say F for this example). Probably a good idea to remove any OEM, EFI, recovery partitions like this. A quick way to do this is to use the
format F: /P:1
- If you feel like it finish up with a
This should do a pass with all zeros, and then a random-number pass.
Note this isn’t a full ‘write random data to every block in the drive’ erase, but should still be secure enough for most purposes.