Problem mount EXT3 partition

Hello i just buy a SDHC 32GB for change my 2GB.
When i want to mount ext3 partion on ubuntu (9.10) for copy rootfs
files i have this message:

Error mounting: mount exited with exit code 32: mount: wrong fs type,
bad option, bad superblock on /dev/mmcblk0p2,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail or so

I try to format in EXT2 and it's ok i can mount and copy files but i
have a kernel panic on beagleboard...
With my 2GB i don't have this problem all works fine.

Help me please!!!