Time to Face Up to the Unfaceuptoable

I think I might have to invest in a new hard drive soon. The big question is if it's worth it to drop a new drive into this old machine, or if I should instead consider finding another system to become that networked file server I've always wanted. I have a SPARCstation laying around that I'm not using, but I don't know if I'll be able to find a suitable disk for it given its age and my lack of documentation for it.