I had a similar issue and it turned out that the hub had come unstuck from the magnetic media and so the disk was not actually spinning. Just the hub. I ended up with a blank disk image as well. AtariZoll advice is good. Download a disk image from Atarimania and convert it to .ST format as the disk has no copy protection on it.
Atari Falcon 030 | Atari 1040 STE | Atari 1040 STFM | Atari 1040 STF | Kryoflux & Supercard Pro Flux boardsAdmin of Atari ST Review Magazine Archive: http://www.ataristreview.com