Just add this line on the WinUAE program Icon:
-disableharddrivesafetycheck .
Explaining better:
- Click on WinUAE icon with the right mouse button;
- Select "proprieties" (sorry for the bad english spells);
- In the line who calls the program simply put "-disableharddrivesafetycheck" after WinUAE.exe.
- Install the hd in the SCSI chain, properly terminated and configurated, starts Windows and then do your job.:-D