You need a USB to IDE 2.5 or an IDE port. I have a SATA-IDE 3.5 2.5 with external power for HD repairing. Plug it on your pc and it will give u a message about to format the drive, select NO. Now run WinUAE and create a std A1200 config and in HD section choose : Add Hard Drive - Pull down until you find the disk (check capacity next to it if you don't know exactly the device.
HD Controller : IDE0 and check Read/Write
Add PC Drives on startup so you can backup it.
If your disk doesn't boots put a bootable disk of DOpus in Floppy 1.
It works 100%, if you have any questions tell me and we will do it via team viewer.