New SD Card wont work - all the others I have do!!

I have two Casio Exilim cameras:

One is a EX-Z55 that is 2 years old. I bought a Transcend 4 Gig 150X card but when I tried to use it, the camera formatted it as a 1 Gig. When I read the card, it has 2 partitions, 1 gig active, 3 unused. I used a utility (HP Drivekey CF Card Utility) and wiped out the partitions, reformating it back to 4 Gig. Back in the camera, and same problem. It says "Memory Full" So I format it again with the camera and it goes back to 1 Gig again. I even tried SDFormatter and no luck there either.

After hours of frustration and no results, I formatted it back to 4 Gig and inserted the card into my 2 day old EX-Z77. I turn the camera on and well well well!! It works perfect and the camera recognizes it as a 4 Gig. I tested it and everything is fine in the Z77. As soon as I pull it out and try the Z55, no luck again.

Conclusion: The Z55 does not support the 4 Gig card and the 2 year newer Z77 does.

If I had a 2 Gig card I would try it but all I have is several 1's and a 4. But that may not work either as the camera formats the 4 as a 1. I figure if it supported 2 gigs it would format the 4 as such.

Hope this helps