Technically speaking, it's the 2TB platter drive full of games that I've pulled from computer to computer over the last 15 years or so. Everything else has failed or become obsolete, but it's still kicking, miraculously.
Eh, they're all old, the important stuff is backed up and I have an 8TB SSD for the newer games, I just pop this in because I have the space and overhead and it's like "well, it's lasted this long, might as well."