PlayStation defines SU-101312-8 as the console being unable to detect its Blu-ray Disc drive. The code appears most often during a system software update, and it is one of the few PS5 codes where a hardware fault is the most likely explanation, especially when the drive has not been removed.
If the reset and a fresh update still show SU-101312-8, the disc drive or its connection to the console has almost certainly failed, and no further software step will fix it. This is true even on a console that has never been opened. Book a repair through PlayStation Repairs, and note that digital games and apps still work while the drive is down, since they do not need the disc drive.
Does SU-101312-8 always mean the disc drive is broken? Not always, but it is the most likely explanation when the official power, router, and update steps do not clear it. PlayStation's guidance treats a persistent SU-101312-8 as a repair case.
Can I still play digital games with this error? Yes. Digital games install from the network and do not use the disc drive, so they usually keep working. Disc games cannot be played until the drive is detected again.
Will resetting the console fix it? Sometimes, if a corrupted update is the trigger, but a reset erases all data on the console, so back up saves to cloud storage or a USB drive first, and treat a reset as the last step before a repair.