
"That makes a 720TB entry system cost $158,400 at list – so not cheap. El Reg storage desk thinks that if it uses 10TB disk drives, then it only needs 72 of them and the effective per-drive cost is $2,200. You can buy a 10TB helium-filled Ultrastar He10 for $525.00 on Amazon."
No, no, no. See, that $2200 per drive is to cover the original drive, and the annual replacement drives for it over the next four years when each of them fails. WD will be lucky to break even on this.
Not that I'm still sore at WD for the crappy drives they put out 15-20 years ago...