The software for your card is here.
You can format the "rest" of the disk with HFS once you've got GS/OS up and running (and updated to a non-buggy HFS driver) to recover the other 128M.
You can format the "rest" of the disk with HFS once you've got GS/OS up and running (and updated to a non-buggy HFS driver) to recover the other 128M.