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cc cleaner on windows wiper

how does drive wiper know what is free space and what is used space

could drive wiper forget to delete some areas
could drive wiper delete existing files by mistake
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ASKER

A defective disk might do anything, but NTTS looks after used / not used just fine on a good disk.

I have not done delete of open space yet

and now I am afraid because my disk may be
defective
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ASKER

thanks for information about drive wiper
Thanks and I was happy to help.