As the paper says, "A good scrubbing with random data will do about as well as can be expected". For any modern PRML/EPRML drive, a few passes of random scrubbing is the best you can do. If you're using a drive which uses encoding technology X, you only need to perform the passes specific to X, and you never need to perform all 35 passes.
#Do i need ccleaner with an ssd full
In fact performing the full 35-pass overwrite is pointless for any drive since it targets a blend of scenarios involving all types of (normally-used) encoding technology, which covers everything back to 30+-year-old MFM methods (if you don't understand that statement, re-read the paper). As a result, they advocate applying the voodoo to PRML and EPRML drives even though it will have no more effect than a simple scrubbing with random data. In the time since this paper was published, some people have treated the 35-pass overwrite technique described in it more as a kind of voodoo incantation to banish evil spirits than the result of a technical analysis of drive encoding techniques. This is from Guttman's paper Secure Deletion of Data from Magnetic and Solid-State Memory In fact Peter Guttman who originally did the research on secure deletion of magnetic media way back in 1996 has since modified his original paper to state as much. 1 Pass of all 1s, all 0s, or random data will completely wipe the drive, and if you are really paranoid 2 passes is more than enough. On the HDD, you really don't need to make multiple passes to completely wipe data. Shortly after deletion the SSD will send commands to reset those sectors to their default state completely erasing the data, effectively achieving a 1 pass overwrite to those sectors. On an SSD and OS with TRIM support (pretty much all of them at this point) deleting from the SSD will completely remove the file, not just the reference. With an ssd you only need to overwrite these files once to make them unrecoverable, with hdds it takes multiple times due to magnetic resonance.
If you delete a file all refrence will be deleted not the file itself.
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