2 slot external hard drive dock with 1 eSATA connection?

[Dajinn]

Does anyone have experiencing using a dual slot external hard drive docking station with only one eSATA port on the back? Do both drives show up in the OS even though only one eSATA cable is connected?

I'm curious because there's a dock I'm looking at that has 2 eSATA ports and many others that only have one. I'm thinking that the dock male connectors internally plug into "two" eSATA host and then are redirected to 1 single output but I want to be sure.

 

[Blue Fox]

There are port multipliers for SATA (function similarly to USB hubs), so it's quite possible there is one of those internally. Only thing I remember about them is that certain SATA controllers didn't seem to support them.