A Specific hard drive XP explorer Cant see

I have a 200gb Maxtor hard drive that if I connect to my computer D: ie no jumpers, by removing the existing D drive, windows explorer, my computer don't see, but on boot up the dos screen sees both the drives ie primary and secondary.I did run Powermax Repair and install, that runs from boot, I formated the new drive D and I think I may have chosen the wrong option. The system drives are NTFS. Any ideas, I hope that I haven't blown the new drive out of the water and made it unsuable for my system,XP Home, Athlon 3200, 1.5 gig ram 200gb C: d: 40gig I'd like it to be 200gig