this post was submitted on 01 Jul 2023
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I am a private person without any state or corporate secrets in hand. I do not do online banking.
My threat model I believe is limited to random drive-by actors.
I was hoping to be able to provide these drives to others to use, the screwdriver and hammer will render them into E-waste. But on that issue, once the platter assembly is disassembled and the platers are separated and mixed up the data on them is probably not recoverable? With the given that each drive has multiple platters.
A few gigs of zeroes will prevent random drive-bys. At that point the partition and filesystem table of at least the first partition is overwritten and you "can" recover files off it but you'll be missing filenames and at least half the files will be corrupt due to fragmentation losing track of which files are where.
I agree with Ono that shred is a good tool for this. If you don't want to use that, try increasing the block size to at least 1M if not 16M to reduce the overhead.