I'm looking for more drives to fill out my JBOD enclosure. I've heard it recommended several times that a good general rule to avoid simultaneous multi-disk failure is to space out when you buy your drives. I assume that this advice is operating under the assumption of brand new drives. (I could be totally wrong in that assumption.)
But what if I'm buying manufacturer recertified drives from somewhere like ServerPartDeals? Should I still avoid buying a bunch of drives at once? Or does the fact that they're used drives, potentially from different batches and with different histories, mean that practice is pointless?