i'm using the wipe free space option to do a deep clean and it's telling me it's removing 600GB of data. is this right? my HDD is 2 TB and has 595GB of free space left. i don't understand how it can remove so much data if it's being used. is the app wiping my HDD?
Yes. It 'wipes' the drive by filling all the unallocated space with zero-fill files, then deletes them. This is standard wiping procedure. At the end of the job the files will be deleted and the free space returned.