Carping at people who are trying to help doesn't do you any favours, FBW. It makes us all think twice about even trying to help you. I know I hummed & ha-ed over responding...
It sounds like you're trying to backup your data from C1 onto C2 then restore the data to a new HD in C1. I gather you have WinXP on C2.
A possible solution:
* Remove the old HD from C1. Plug it into the second IDE channel on C2 (use the data cable from C1) or into the slave plug on C2's primary HD (if it has one that will be a second connector on C2's HD data cable)
* Use 'xxcopy' software as mentioned by Mac the Knife to copy the contents of C1 HD to C2 HD (now they're in the same machine).
* Replace the old C1 HD (in C2) with the new C1 HD.
* Use 'xxcopy' to copy the stored C1 data on C2 onto the new C1 HD.
* Remove the C1 HD from C2 & install into C1.
Some notes:
You won't have to mount the C1 disks in C2, it's sufficient to just plug the power & data cables in. Sit the C1 HD on any convenient non-conducting surface.
Make sure the jumpers on C1 HD are set appropriately. You will need to set C1 HD to 'slave' if you plug it into a second connector on the same cable as C2 HD.
If you DON'T have WinXP on C2 ie you have DOS or Win9x then you will first have to remove the 'active' or 'boot' attribute from the boot partition in the C1 disk. This will need to be done BEFORE you remove the HD from C1. A good piece of software is 'Ranish Partition Manager'. It beats the hell out of M$ 'fdisk' (and is free!).
'Norton Ghost' or equivalent software will also do the job, same as 'xxcopy'. Xxcopy is free but is a command line interface: No point & click.
Make sure you have a working DOS boot floppy with necessary software on it ie 'xxcopy', 'ranish PM', Powerquest 'Partition Magic' etc.