Are SD cards the same?

[Bezor]

For use in my Palm Tungsten.

I put in a Cannon MMC-32 SC card and it will playback music in my Palm.  Since I wanted more memory, I bought a SanDisk multi-sue 2gb SD. 

The SanDisk won't play back, and the Palm states there are no readable files on the SD card.  I take the SanDisk out, but in the Cannon and instant music.

So, what's up with the SanDisk that it won't play back my files?

[Ultra]

For use in my Palm Tungsten.

I put in a Cannon MMC-32 SC card and it will playback music in my Palm.  Since I wanted more memory, I bought a SanDisk multi-sue 2gb SD. 

The SanDisk won't play back, and the Palm states there are no readable files on the SD card.  I take the SanDisk out, but in the Cannon and instant music.

So, what's up with the SanDisk that it won't play back my files?

Never had anything with SD discs.   Always had Compact Flash.