I didn't mention anything about reformatting. Once you fill up a usb drive or hard drive the data will always be there until you get new data which will over-write old data that's there. You can still recover data after reformatting but if you've downloaded stuff recently or put stuff on a drive then more and more old data will not be recoverable. So if you ever plan on selling a drive with sensitive information, to be safe, besides formatting and using secure deleting programs you can just copy a stupid movie until the drive fills up and old data should be over-written.
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