I've always used manufacturers disk tools software, every manufacturer has free ones, although some (like older Fujitsu) were harder to come by, even then, you can boot it in with another manufacturers drive as slave, and use the same tools on off brands. Every major HDD manufacturer has these freely accessible for DL from their website. If I was concerned about a virus seeping over a format, I'd let it write zeros to the entire drive, but later found that to be unnecessary. These are good enough to keep anything from "going over" a format, onto a new installation. If you are totally concerned about someone hacking info off of one beyond this, beat it to pieces with a hammer, run it through a shredder, burn it in an incinerator, and keep the ashes under your pillow
(I'd never attempt to reuse a drive with such secret info on it, and if you are asking about it here, you have no business being in such a drives possession ; )
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