You would want to use a third party application. I like Paragon Hard Disk utility. Basically, anything that will erase and wipe your HD using an algorithm to jumble any left over information is what you want. I think Paragon uses US DoD. Obviously, the most secure way is to get it shredded, but that won’t work if the donation place needs it working 🙂
Or burn them with a blow torch.
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