Every time I insert it I can see mmcda listed in /cat/partitions. When I go to mount it to an empty directory, however, I get this:
Mount: mounting /dev/mmcda1 on /mnt/blah failed: Invalid argument.
When I set the SD card as read-only by the little switch on it, it gives me many of these messages before reporting the same error:
mount: /dev/mmcda1 is write-protected, mounting read only
Does the SD card have a bad partition or something? Like I said, this worked fine on the old Sharp ROM (but there's no way I'm going back now, I heart OZ!).