What wiping free space does is to erase that old data from files that you have deleted in the past, so that it can't be recovered. This means that the data from the deleted file is still there until it is overwritten by something new, and so it can sometimes be reconstructed by a recovery tool like Recuva. When you delete a file in Windows rather than deleting the actual data Windows just marks the space that the file was occupying as 'free', so that another file can then be written to those blocks on your hard drive. It is not going to 'speed up' your computer, or make any more space available on the drive. It will make no difference whatsoever to the performance of your computer. I would question why you seem to be wiping free space on a regular basis? The GX620 is a test machine that has been stripped of software and rebuilt and it is a test-bed. issue as though a journal is filling and not clearing. I am currently treating the installations as disposable with a rebuild required around 6 months or when the wipe task fails. In comparison the Dell 755 and Dell 760 running installations several years old are now returning wipe MFT times of 35 minutes and 60 minutes, respectively. The GX620 didn't report any issues and now runs the Wipe MFT free-space in 2 minutes a full task completes in 2 hours 5 minutes. The solution was to rebuild the software with a clean installation of Windows 10, loading back the programs and personal files and testing the free-space wipe at intervals. The task would fail after about 2 hours running, before 50% completed, although repeated attempts (about half a dozen) eventually brought success. This PC has 53805 folders, 313894 files and 195 MB MFT. The old Dell GX620 would not complete the wipe free-space task without reporting an insufficient resource. I run three Dell computers with the same programs and personal files. This was initially reported as a bug here in 2013. I am experiencing a prolonged wipe free-space task with CCleaner and Windows 10 v1909.
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