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each standard server rack can store 2400 TB of data if fully populated with 10 TB

Thats 600 in a 42u rack

AWS was doing 1100 disk in their previous generation storage 42u rack (used 8TB disks for 8.8PB).

SuperMicro has a 90 disk top-loading 4U storage server. It's deeper, of course.

However, they probably thought about standard 2U servers with no second disk row, so 12 disks per 2U = 252 disks / rack.

Ah, yeah, forgot about those. so many disks.

I think the Sun Thumper kinda invented the concept - many successful copies since :)