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Secure wiping/shredding of free disk space with many methods
...See the project homepage https://wipefreespace.sourceforge.io and the project Wiki in the menu above.
To prevent clear-text data from being left on the drive in the first place, you can use LibSecRm (https://libsecrm.sourceforge.io), which wipes the data on-the-fly.
...I created this very simple 70 line program that will generate a text file with your choice of extension however may bytes you enter. I believe this could be used to permanently wipe hard drives if reused multiple times. Or just use up a shit-ton of hard drive space on a computer if you choose to do so.
I called it "Big 0" because it can generate a big file full of zeros.