NO NO NO NO NO NO NO!! STOP!!! :-x
Don't EVER make XP initiate or install the disk, for that causes XP to partition the disk, and maybe wiping out the RDB in the process. All you have to do is make sure the harddrive is recognized in the bios, and then make sure XP does not touch the harddrive at all on startup. Then it's just a matter of letting WinUAE know which harddrive to use. If you let XP initiate/install the drive, it has then written a RDB to the drive so WinUAE cannot use it, (and neither can your dead A1200T or any other Amiga)
Phew!
Thanks for the warning.... Luckily I didn't change any BIOS settings, I just plugged in, turned on the PC and downloaded WinUAE 0.8.24 last night and found the option to select a hard drive...
And it worked a treat! :-)
I've managed to copy all my files etc from the Amiga's HDD to my PC without any problems. I might even reformat the ex-Amiga HDD and use that as a dedicated UAE partition.