Hi Thom,
I have a 1G Trancend card too. Works on all Atari-systems I have.
It's a 40x speed version.
Best is to start from the beginning again.
So, download and read the manual.
http://www.atarimax.com/flashcart/forum ... .php?t=490
run fdisk, autodetect, check parameters.
make partitions / image-room like in the manual.
other option:
download the scandisk program and let this check your setup.
http://www.atarimax.com/flashcart/forum ... .php?t=265
Let me know how it goes.
Cheers,
Sijmen.