You also have to factor in the pods/disks failing at N$/month and making sure the data is backed up in a redundant manner (more than 200 pods?). And skilled hel

You also have to factor in the pods/disks failing at N$/month and making sure the data is backed up in a redundant manner (more than 200 pods?). And skilled helper monkeys to swap bad disks. And electricity. You also probably want something that reads really, really fast, and is durable. And you don't care about writes. I'm not sure, but 45 drives on a bus sounds congested. Maybe some sort of fancy super optical situation. DVDs fit the bill but I don't know about seek time on them. (?). Anyway, the answer is laserdisc, the answer is always laserdisc.