We’ve all watched tv forensic crime shows where someone tries to delete damaging evidence from their computer. On these shows, the narrator explains how when you ‘delete’ something from a computer, the data is just moved somewhere else. It does not disappear.
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Typically, when you delete a file on a computer, it isn’t actually moved anywhere, but the file location is removed from the computer’s directory structure.
Over time, the computer may overwrite some or all of the “deleted” file as that part of the disk was marked as unused.
A secure erase can be used, at least with older-style magnetic hard drives, where prior to the removal of the file name from the directory, a series of zeroes or random digits is overwritten on the file itself. However, even with that erasure method, it is possible to still recover the erased data. It is just much more difficult.
When the hand recount / audit in Wisconsin led by Governor Walker shows a lot more Trump votes and corresponds to the switched votes- conclusive proof of the algorithm.