If an SSD fails, is it re-usable?
No. Failure of an SSD means the NAND flash memory modules have broken and no longer work. Formatting and covering up bad blocks for disk re-use doesn't work on SSDs.
So if it fails I cannot use the ssd anymore?
If it fails while under warranty, RMA the drive. If you're not within warranty, you're out of luck and will need to buy a new one.
SSDs aren't as forgiving as older magnetic disk drives. Pretty much any manufacturer of SSDs will swap it out in a fairly easy manner, but there is little to no chance of recovering data from a broken SSD, so make backups!
Geez, I've been preaching backups since the 80's, and even now it's needed! Yes, I'm old...
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