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USB external hard drive cases are supplied with SATA and power connectors attached to the circuit board in the case. If you canot connect it to the SATA hard drive then you may have the wrong drive case, your case may be a IDE or SCSI type.
If both drives are SATA (not "parallel-ATA") drives, then "swap" the physical location of the two drives, to see if only the "top" (or the "bottom") drive is NEVER detected. Or, if the "detected" drive moves after the drives are swapped, then the non-detected drive has a problem. In that case, remove the "good" drive, to see if the "bad" drive can be detected when it is the only active drive.
I have the same problem with the same enclosure. I found out it is the power supply problem. It worked the first time out of the box. But when the black 12V/5V power supply box heats up, if I turn it off, and on again, my hard drive won't spin up. It had buzz sounds and tried to spin. I think they use a crappy power supply that can't supply enough current during drive spin up when temperature goes up.
My solution is to unplug the whole unit from the wall when you don't use it. That give the crappy power supply time to cool down, so next time when you turn it on, it'll start from cold. This solutoin worked for my 300G Seagate drive. For my smaller WD drive, it doesn't require cold start. I guess it makes sense, as bigger drives require more current to spin up.
ATA, or (PATA) hard drives use the older "seatbelt" 40 or 80 pin ribbon interface cable, whereas SATA is fairly new using the small, thin interface cable found in most computers manafactured in the last 12-18 months, hope it helps
have you checked all drives out see if any cables have come loose and call out an engineer to sort problem out check power cable this is the only sugestion I can give.
hope you can sort this out.