SSD in external usb 3.0 case not recognized Mac mini 2009
Intel SSD 330 60 Gb
IcyBox IB-AC603a USB 3.0


I can't see the SSD in Desktop nor in Disk Utility. I don't know what to do as it is said to be USB 2.0 friendly in case's documentation.
USB 2.0 doesn't provide enough power for the SSD in an enclosure unless you have a case that has a plug where you may add more power (and that's going to be hard to find because USB 3.0 2.5" enclosures normally do not require such extra power and, therefore, will not have the 5v power port).

Or try a powered USB hub between the case and the Mac. That may work.