Als root auf dem MISTer einloggen, dann die Speicherkarten listen:
fdisk -l
# ....lots of disks, this one is interesting, the boot disk is /dev/mmcblk0,
# so don't use that one
Device Boot Start End Sectors Size Id Type
/dev/sda1 2048 499738623 499736576 238.3G 7 HPFS/NTFS/exFAT
/dev/sda2 499738624 499744767 6144 3M a2 unknown
#mount the partition
mkdir /tmp/newfat
mount /dev/sda1 /tmp/newfat
#rsync --delete for hard sync and remove any non-source files on the target
rsync -rltD --delete --inplace --ignore-errors --no-whole-file --progress /media/fat/ /tmp/newfat/