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Use third-party data destruction software to completely erase all of your data, including files and folders that were hidden or encrypted with encryption software.Use the built-in tools in Windows or Mac OS X to delete any personal files you no longer need.Boot your computer into Safe Mode with Networking.To securely erase all data on your computer, follow these simple steps: If you don’t, you won’t be able to recover the data after the process is complete. If you want to wipe your hard drive, be sure to do so before you proceed.
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Formatting a hard drive before selling is good practice, but even that won’t be enough to wipe the data completely. A deleted file can be recovered through a file recovery program or special hardware. The data on a computer can be erased by moving it to the Trash Bin, but that’s not the same as wiping it.
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