Trying it on a diffrent usb2 enclosure is probably the best option at this stage.
Don't forget the simple rule for the safecom enclosure
1.The HD must have the jumpers set to master
2. The HD must be formated fat32. Uusing the browser utility utils is advised. - DONT DO THIS IF YOU CURRENTLY HAVE DATA THAT I S IMPORTTANT TO YOU.
Let us no how you get on when you have tried the new usb2 enclosure
Regards
BP1
BTBroadband