Hi Pete,
This is a new issue to me.
I've tried CF upto 32Mb upto 1 Gb and that all works fine.
You can try and make a partition-table by hand on the PC, copy Mydos43.atr to
partition 1 and check this out on the Atari. You need a sector-editor, found easily
with google.
You haven't got SECAM atari's by any chance?
Later Sijmen.
Try this (as bootsector 0, first 32 bytes, the rest can be zerod).
d7 ff 03 ff 03 ff 20 ff 01 ff 01 ff 00 ff 00 ff 01 ff 01 ff 00 ff 07 ff 00 ff 00 ff 00 ff 00 ff