You buy a Greaseweazle like this -> https://sordan.ie/product/1530/greaseweazle-v41-usb-floppy-adapter-flux-reader-writer--case/

Put an old PC floppy on it and connect it via USB with your A600GS. Then you set any of the four floppies (DF0 to DF3) as REAL DISK drive in the A600GS menu and maybe even one as virtual floppy drive.

Then you have two options :

1) boot up any AmigaOS (self installed or Amibench) and use any transfer utility like TRANSADF, TSGUI or AMIBLITZER to write any ADF to the REAL DRIVE or
2) use for example X-Copy, insert ADF in virtual Drive, real disk in real drive and do a copy 1:1

Both works fine ...

Yes, use a Greaseweazle 

I don't have a FastATA-1200, but there's a switch in the old ATA3.driver called "NOPART".

Maybe it's for using NO SPLIT-Mode without prefs? 

ATA3.driver QUIET RESIDENT NOPART

Worth a go. Just as long as the OPs early software has that feature.

Breaking news from the pixel universe! 



I’m right in the middle of my sprite‑making marathon… and guess what — only 6 more to go before the whole set is complete!
Our hero is coming to life frame by frame, and soon he’ll be ready to run, jump, and (hopefully) save the world — or at least the level.
Huge thanks to all of you following the development with so much hype. You’re basically the fuel keeping my creative engine running!
Stay tuned… the finish line is in sight!

Thanks. I went into WinUAE and started workbench. I selected the HDTOOLS and then selected information to change it from scsi.device to oktagon.device. I then tried HD Tools again and it still doesn't show anything