become root (root sh installed and type sudo gainroot).
type:

sfdisk -l /dev/mmcblk1
file -s /dev'mmcblk1
file -s /dev'mmcblk1p1
file -s /dev'mmcblk1p2

paste the output here.

As long as you have partition (dos/doze don't care) mkdosfs should format cleanly.

Check your block device is okay, ie you have the magnet under the stand still.