Go with 5x3 (five 3.5" drives in three 5.25" bays) mobile racks. These will accept SAS/SATA drives and are hot swappable. If you use an intelligent raid host bus adapter you just swap the drive when you hear the warning whistle go off! The drive that's misbehaving will have a red light.
That sounds like a rather pricey solution.
God dammit!
I just pissed away 4 hours on TVtropes.
Fuck you internet, FUCK YOU!
For data protection, I'll take an approach of someday wiping out tons of old junk, duplicate files, that sort of thing, cutting the total space used, and then swarm - tons of drives.
