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hi, I replaced my hdd with a samsung evo ssd then the internal superdrive with the hdd. so far so good. however, when connecting the former internal (now external) superdrive via usb, is not detected. could anyone help fixing this? thanks in advance

Lets backup here a bit, As you may have put your data at risk! The optical drive port does not offer HD crash guard so placing HD’s on its connection that does not have crash guard onboard the drive its self puts it at risk. If you moved the original Apple HD over it does not have it onboard. I would recommend you put the HD back in the HD bay and put the SSD in the optical drive carrier. In your system both SATA ports are same speed and you can boot up on any SATA port. As for the Optical drive running externally are you sure the USB port is OK?