My HD Enclosure was a Disappointment

I was enthusiastic today when I received the Hard Disk Enclosure that I ordered from a friend. Already thinking of transferring some data from my computer because it's already loaded with my video collection and my brother's music collection. but when I reached home and plugged it in, the computer won't detect it as a storage device. It only detects that there is some new device inserted in the computer. I have to contact my friend again to see what wrong and to have it fixed immediately. I hope it will be done by tomorrow.