Disk read issues on track 0 with OSI 4P

Hi all, I've been struggling with getting my Ohio Scientific + MPI floppy drive system working for almost 2 years now. It's been by far my longest 'on and off' project, and in the process I've all but rebuilt the entire drive. I have been using a program for the OSI called DISKREAD which basically just dumps what data it reads from the disk to the screen. Up until recently I wasn't having much luck seeing anything meaningful, but after some more playing around I was finally able to see some data from an OSI boot disk that indeed looked good. I was able to cross reference what I was seeing against a disk image I downloaded off the net, and from track 1 onwards the data looks identical. The problem is track 0. Track 0 contains the boot code. When I dump track 0 it just looks all screwed up, mostly lots of 00's and FF's and F1's and FD's etc etc...basically stuff that just looks wrong. It also seems that doing subsequent passes over track 0 dumps different data each time!!!! I was just wondering if anyone knows what would cause track 0 to read bad and inconsistently, where other tracks seem to read good and consistent? Thanks for for your time. Phil