The disk is a Seagate Barracuda 1TB 7200RPM. This morning a random restart occurred and right after my PC says "insert boot media" which I attribute to windows failing to update for some time now, but then I go to download something and the HDD is gone, from dsk manager, from explorer and nothing from event viewer to say its failing or failed. But a few months ago the disk started getting 100% active time with no load and forced me to reinstall windows to my SSD, because you had to wait 2 minutes to open explorer. Is it really dead if the bios can still see it connected or is it some other very special issue? The drive is somewhere between 6 and 13 years old, every other PC part is ~2 years old