If you want to completely wipe hard drive and make the data gone forever and unrecoverable, you can use the hard drive wipe software to remove the data on hard disk permanently. Some data may be retrievable from slack space. Even if you overwrite some new data to the hard drive, some data may still be able to be recovered if the new data doesn’t occupy the entire cluster space of the old data. It just deletes the reference of the data in the allocation table and you can’t find it.īy using some data recovery software, you can recover the deleted data and files. They are still located on the hard drive.

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