i did bought transcend 256Mb CF card for zaurus and I tried to flash with, no lights!
I did try couple times and formatted both time it before flashing (fat16) no success, same thing with my digitalcameras 64Mb micro memory's CF card.
but with my cameras other card which is Sandisk 128Mb it did work, same was with Sandisk's 512Mb card.
So my conclusion was that all CF cards just won't work with flashing!
All card works great when just reading and writing in files from cards in Z.