When you format a hard drive or delete a partition, you're usually just deleting the file system, making the data invisible or no longer actively indexed, but not gone. A file recovery program or special hardware often restores the information. If you want to be sure that your private information is gone forever, you need to wipe the hard drive using special software.
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How to completely wipe a hard drive or SSD
This process can take several minutes to several hours depending on the size of the device and the method you choose.
Back up everything you want to keep, e.g. photos, software product keys, etc. Once the hard drive is done, there will be absolutely no way to get anything back on the drive.
Download a free program to destroy data. All of the first six programs we recommend on that list will work great because they can be used to wipe a hard drive outside of Windows, a necessary feature if you want to wipe the drive on which Windows is installed.