system partition xfer, remove old OS.

awhile back I added a hard disk as primary 1 (NTFS, partition D) and installed XP on it.   My original hard disk is primary 0 (Fat32, partition C) with ME on it.   Both disks are set to cable select.   The original disk is the system partition, and the new disk is a boot partition.    So when I boot with both disks with cable attached everything is fine, I get the OS select screen, all okay. 

I would like to now remove the old disk (primary 0, FAT32, system partition C) and just boot directly from the new disk.   However when I detach the old disk I get the message that hard disk 0 not found, F1 to continue, F2 for setup.

I assume the problem is that the system partition is still on the old disk (boot.ini, ??, etc) and that somehow I must transfer this to the new disk for everything to work okay.    Or maybe I'm just don't know what I'm talking about.

I've tried detaching the old disk and attaching the new disk to the end of the cable (primary 0), but still same message & no luck.

Any ideas on how to accomplish this?   I would like to re-format the old disk to NTFS & use as file storage.

Thanks in advance for help!

Gtwarrior