Connect 512 hard disks to 1 card, how?

[Jasis]

Hi. I saw this HBA card of LSI:

LSI SAS 9201-16i

It says this card supports '512 Non-RAID SAS/SATA devices'. I am wondering how to connect that many.

I know the 4 ports on it are all SAS and 1 SAS=4 SATA, but even though there are only 16 SATA, and 512/16=32, which means 1 sata port needs to connect 32 drives.

There is no way to put all the disks into one chassis, so there must be many external chassis, but I didn't see any external port on this card, so how do people do to connect 512 drives? Is there a sata cable goes across the chassis and connect the external devices? Photos or sketches would be the most appreciated.

 

[RealBeast]

You would probably want to go with SAS backplane expanders, which can come in very large sizes if you have a very large wallet. Each SAS port has a limit of 128 devices but your usage may dictate a smaller number. HERE is a bunch of pictures to give you an idea what I'm talking about.