I'd say it was just paranoia but CrystalDiskInfo, speedfan, homeserver smart are all giving me warnings and saying I should replace the disk.
If it was just clunking it would be one thing, but the server is freaking out about the drive. Once the drive acts up the server starts freaking out. I start losing connection to the server because everythings hanging up and slowing down once the drive acts up, as I'm assuming its trying to make a copy of something on that drive, or the drive is the one something else is being copied to. The server becomes essentially useless, as I can't access it for more than a couple minutes before it tries to get something off that drive, and if it acts up when it is trying the server freaks out, spits out errors/warnings/etc.