%y, your MB is full.

This is the info:

The standard SanDisk 1Gb cards I've always been able to use the image tool on with no problem. This is on the voice mail II boards. I'm not sure if they work on the version one cards.

The 2Gb cards need to be formatted with Datalight's Rom Dos. I wouldn't bother unless you want to do it just because you can. I can't imagine anybody would need that kind of storage on the DX.

https://www.datalight.com/products/romdos/