You could try cleaning the drive with a cleaner disk, the kind you squirt a little isopropyl alchohol into. This has brought a few drives back to life for me.
The A600 was an under estimated machine. It's easy to add 2.5" IDE (laptop) hard drive, the interface is already there. Commodore left the drive light pin out of the connector on some units, but, it's easy enough to add another one. Together with a 2Meg fast ram expansion, I used an A600 to surf the web when I first got online. It's amazing how much the old machines can keep up with modern trends.
