You can reserve space by setting host protected area (HPA). There are even people theorizing this might add provisioning are to an SSD https://www.thomas-krenn.

You can reserve space by setting host protected area (HPA). There are even people theorizing this might add provisioning are to an SSD https://www.thomas-krenn.com/en/wiki/SSD_Over-provisioning_using_hdparm https://www.thomas-krenn.com/en/wiki/SSD_Over-provisioning_u... . But so far there is zero evidence for it. HPA is not a magic nobody touches area, its an area reserved for special superuser use and no Drive will simply start reusing it for its own internal processes.