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If you have SSD, encrypt the whole drive with VeraCrypt. Then in case you want to replace the drive, you just need to format or wipe the drive, ideally with the tools provided by each manufacturer - those always contain Secure Erase function. It takes seconds.
For HDDs, rewriting with Dban is the best option, though it can take hours or even days for large drives.
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no sig, sorry 
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