accessing file system of MMC
 

i've got problems with reading the file system of a multimedia card. i've got a MMC/SD/CF card reader attached to usb. i've compiled the following things as modules:

Device Drivers ---> USB support ---> USB Mass Storage support
Device Drivers ---> SCSI device support ---> SCSI disk support
Device Drivers ---> ATA/ATAPI/MFM/RLL support ---> SCSi emulation support

as far as i know it should be sufficient, since i don't need special block devices for MMC. now the card should be available as /dev/sda, and in fact it is (system log says it's detected the device), even though after typing fdisk -l it doesn't show it's partitions. when i try to mount it using mount /dev/sda1 /mnt/blah-blah-blah it says there's no medium inserted, and when i'm trying to run cfdisk (or fdisk) /dev/sda it says it can't read the device. has anyone an idea what's wrong?