I think I see what you mean: any deleted file that has been overwritten by any live file is truly wiped. True, a WFS won't overwrite any live files, one hopes. A partitioned or multi-plattered drive will have start, centre and end clusters not necessarily at the physical start, middle or end of the disk. I don't know what algorithms Windows uses for space allocation (unlike my former IBM life). is likely to avoid the slower access end of the disc, and will therefore allocate sectors with faster access, such as the newly deleted file. When a new file is created it uses sectors within free space, and I believe the O.S. There will be edit copies, user and prefetch defrags, sys logs etc that won't be obverwritten by secure deletion. I understand that WFS uses one pass of zeroes, but I've never run it to check. I suggest you need luck for the deleted file sectors to still be available as free space for a 35 pass wipe.Īm I correct in understanding that Wipe Free space is governed by the 1/3/7/35 Pass Options under Tools => Drive Wiper => Security ? is likely to avoid the slower access end of the disc,Īnd will therefore allocate sectors with faster access, such as the newly deleted file.Ī subsequent Wipe Freespace will NOT wipe the sectors that have been over-written by the new file.Īny old deleted file that has been over-written by a file with random noise pattern data has had the equivalent of a single pass random wipe.Īny old deleted file that has been over-written by a file with non-random information has had the equivalent of a single pass NON-random wipe. When a new file is created it uses sectors within free space,Īnd I believe the O.S. If a file has been deleted without being securely deleted the sectors which it used have become part of free space. If all files are securely deleted, then all free space is already wiped,Īnd over one year most of it will have never received a file so a weekly wipe * 35 pass is tending towards overkill ! ! ! I consider anything more than a single pass to be a self-evident waste of time because :. Am I correct in understanding that Wipe Free space is governed by the 1/3/7/35 Pass Options under Tools => Drive Wiper => Security ?
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