on Aug 6, 2014 at 3:32:55 pm Last Edited By EricBowen on Aug 6, 2014 at 3:34:52 pm
The TB controller likely didn't have the resources available for both drive controllers. Some controllers firmware don't have allot of options for resources depending on how the firmware is implemented. If those resource ranges are not available then either the device wont initialize or the controller will not complete the startup sequence. Also remember TB is not endless in bandwidth and latency is increased for every device added. The 20Gbs bandwidth is divided among all devices attached. Once you get beyond 3 or 4 devices then your chance of running into problems will increase.