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Is it good old format c:
That barely affects the magnetic domains/flash cells. Overwriting with junk data is the way, there are tools for that https://en.m.wikipedia.org/wiki/List_of_data-erasing_software
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The key question is whether it is a spinning HDD or SSD.
Single overwrite with any data is fine for HDD. Unless the CIA are likely to be looking at it.
SSD needs the manufacturer's wipe utility as there is no other way of accessing the individual blocks.
If in any doubt, physical destruction works for either.
gbj_tester
chez_jay
@ketsbaia
At the risk of ending up in the tofu-eating thread, I'm donating my old laptop to charity shortly. Want to check up on how to wipe everything off it before I do. Is it good old format c: like in the good old days or is there a better/more up-to-date way of doing it now?
Cheers.