you can find 2 sd images that work on Satandisk, I suppose they will work also on Ultrasatan, that uses a 2Gb card at it's full.
There are two versions, because not all the 2Gb SD cards, have the same capacity, so if you're unlucky to have the lower, you'll loose the last partition.
I think the FAT was touched somehow to use the 2Gb, so if you change it with HDDriver or whatever, it's likely that you'll loose the ability to use the card at it's full size again.
260ST, 520ST, 520ST+, 520STFM, 1040STE, 4160STE, STACY 2, MEGA ST2, MEGA ST4, MEGA STE, TT030, FALCON030, FALCON030 with Centurbo 2rB, Firebee
SH204, Megafile 30, Megafile 60, Megafile 44
SM124, SM125, SM146, SC1224, SC1435
Satandisk, Ultrasatan, HxC SD, Hxc SD Slim, NetUSBee, CosmosEX, Gotek HxC, MicroCosmos
2600VCS, LYNX, LYNX II, JAGUAR