Those drives probably pre-date the "race to the bottom" on quality. Enjoy while you can, newer drives are probably going to be worse in terms of reliability.
Luckily I have 3 'spare' NiB 3tb hard drives sitting in the closet. A seagate, a toshiba, and a WD. I just hope the bearings haven't flattened. (I do try to turn them once a month or so). All are over 3 years old.
The bearings in HD's are actually quite fragile. If you let them sit in one position for years, they will develop a flat spot due to gravity. Best practices are to (literally) rotate the dry storage drives every 6 months or so.