I bought 20 drives on ebay and cloned them from the drive that came with my machine. It isn't difficult, but you need the right cables and software.
Here is a link to the cables I bought
USB 2 0 to IDE SATA 5 25 s ATA 2 5 3 5 Adapter Cable | eBay
I don't recall the cloning package I used, but I can check at work tomorrow.
I cloned all the drives and that may be the nut for you to crack. If you can't clone your existing drive, I can help you out.
Regards, Ray