The only real way to actually wipe a drive so nothing can be recovered is a complete overwrite of the complete drive, usually consisting of all zeros, except the 511th and 512th byte.those are left with the code that allows the BIOS of an MBR system to recognize the drive is ok to write to. Just re-installing an OS only over writes the area previously used by the OS. Even thou it is no longer 'visible', the data remains on the disk and isn't permanently removed until it's overwritten with new data. Little ricky, When files are deleted from your computer/disk formatted, you are simply deleting the directory listing for the particular file. I had an old drive here that I did a complete format on, but decided to check it UEFI and GPT systems are a bit more difficult, but again, unless the complete drive is over written, old data that isn't part of the O/S could be recovered with advanced methods. Or take a hammer and nail to it and completely destroy the platters inside. ![]()
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