You also have to account for the expected writes. Modern SSDs may perform better (over time) with TRIM, but if you just create (or leave) an erased partition to

You also have to account for the expected writes. Modern SSDs may perform better (over time) with TRIM, but if you just create (or leave) an erased partition to bump the effective over-provisioning even cheap consumer SSDs should outlast the expected usage for a cute little retro computing system. It would be different if you used them them 24/7 to keep some old, but demanding peripheral alive (e.g. a large old printing machine) running. If you can schedule the downtime you could still, image the disk, erase it, and restore the disk every few months under the guise of preventive maintenance. Heck if you (net-)boot Linux or *BSD depending on the IDE<->SATA bridge used you may be able to send TRIM/UNMAP commands to the SSD without opening case. Of course each such backup/erase/restore cycle would be equivalent to a full drive write.