Yes I purchased a simpletech. yes I purchased a simpletech 500gb usb harddrive and it did work

Question

yes I purchased a simpletech 500gb usb harddrive and it did work fine in the computer but then I hooked it up to my dishnetwork reciever to put movies on it. I had to reformatte it after that I put movies on it it worked fine until I tried to hook it up to the computer again and now it won't reconize it I guess I shouldn't of reformatted it but how can I get it back to normal again. All the computer says in device manager is it is an hitichi drive thats it Please help