I'd like to have about 50TB so I would have a central location to store all of my VMs at work.
If Fujitsu can do the spec'd density, you just might get it.
I invented RAID-5 (simultaneously with Patterson, et al) at the MN Supercomputer Center in 1986. We used rows of IBM 3380 DASDs hooked to an IBM mainframe acting as a NAS for a pair of CRAY-2s. Each DASD cabinet was 7ft high and 30ft long. The platters were 170GB total, cost circa $2 million.
Today you can buy the same capacity with better speed for $60.