Hi Hans It just occurred to me that your system may have the same problem mine did when I first got it. I was seeing occasional bad reads. I took the drives apart to clean the heads when I noticed something funny. Both disk drives had terminators installed. I removed one of these and my problems went away. It was such a long time ago that I'd forgot about it. While tracing down signals for my 512K fix, I noticed the terminator R-Pack that I'd taped to the disk drive ( I try to follow the first rule of intelligent tinkering: "Save All the Pieces" ). I had to go back through the thought process of why it was there. Eventually, I remembered that you were having drive problems. Strange how the mind works sometimes. Dwight