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Depends on the type of drives and your needs.
If the drive is big enough to be used as storage/back, get it out and in its own USB enclosure.
If the drive is either too small or you have too may already then :
- SSD : smash it to pieces with a hammer
- HDD : if you’re sure it’s not an hybrid (in which case the SSD process applies) then you can just fill it with garbage or use whatever “erasing” software out there. I would go for an open-source one.
But unavailable in many countries (especially developping ones).