I had to unpack and mount 60 hard drives, tedious work but worth it to get to play with this beast.
The Dell PowerVault MD3460, 5 sliding trays that each support 12 hard drives up to 6 TB each. This customer went with 4 TB each drive.
The configuration was 58 x 4 TB + 2x 8 GB Zeus RAM from HGST (this is a ZFS setup).
So, grand total 232 TB of raw (before parity/formatting/si conversions) disk capacity. Might be enough to store an 8K resolution movie.
Here’s the manual for those who are curious: Powervault MD3460 Manual (pdf)