Silex Server + External SATA-USB enclosures

[drsox]

Anybody tried to use a Silex USB server with an external SATA-USB enclosure ?

I have a Samsung SATA DVD drive in one of these enclosures.
If I connect it directly to my MBA then OSX recognises the Samsung DVD unit OK.
If I connect it to the USB server (other side of the room) that connects through WiFi then OSX only recognises the SATA-USB chipset not the Samsung DVD unit.

Connection path is :
Samsung DVD unit in SATA-USB enclosure > USB connection to Silex USB server > Ethernet to Airport Express > WiFi to MacBook Air

Native Win7 (on a PC) recognises the Samsung DVD OK.
OSX recognises an Epson scanner connected the same way OK.

 

[drsox]

UPDATE :

Problem solved - the drivers were duff and need to be installed twice.
Now I have a clean work surface again with minimal wires and all the heavy iron (Scanner, DVD drive, Printer and anything else I can connect via USB) can now sit on another work surface 10+ feet away. If/when there is a good TB hub, then I'll use that as well/instead.