Well outside my realm of expertise (as if I had a realm!), . . .
How many drives would you need, to be able to set up a RAID, or hot swappable RAUD (Redundant Array of Unreliable Drives), that could give decent reliability with such drives?
How many to be able to not have data loss if a second one dies before the first casualty is replaced? How many to be able to avoid data loss if a third one dies before the first two are replaced?
How many technicians with shopping carts full of spare drives? (cf. early vaccum tube computers?)
