1. Boot into recovery
novacom boot mem:// < installuImage

2. Reduce media filesystem
resizefat -v /dev/store/media 20G

3. Reduce media partition
lvm.static lvresize -L 20G /dev/store/media

4. Create ext3fs partition
lvm.static lvcreate -l 100%FREE -n ext3fs /dev/store

5. Create ext3fs filesystem
mkfs.ext3 /dev/store/ext3fs

6. Add the ext3fs partition to the fstab file (it should be done automatically by the meta doctor, will research later)
mount /dev/store/root /media/realroot
echo /dev/mapper/store-ext3fs    /media/ext3fs    ext3    noatime,data=writeback    0   0 >> /media/realroot/etc/fstab
umount /dev/store/root