There are situations where it's not possible to run the trim command, for example some external usb ssd drives don't support it.
If you're not concerned with the ssd drive degrading in any way, shape or form, does scrubbing work to completely remove deleted files in the free space of ssd drives?
Is this also a solution to wipe deleted files on a non trim supported ssd drive, even if it might be less effective?
After more intensive scrubbing with the command line scrub tool (scrub -X -p schneier test which does 7 passes) I could recover only 1/10th of what I could recover before. So I guess it does have effect.
One pass erase is enough. Any additional passes cause unnecessary wearing of your disk. SSDs can't hold old data after overwriting in any way. However you need to write all free space to be sure. You can use commands like:
dd if=/dev/zero of=/home/clean.big
rm /home/clean.big
In Windows you can use SDelete.
