Ok, I have a problem now. I tried to repartition using GParted to add an extended partition, so I backed up all the data on my Alt_OS, rootfs and the other partition which holds the Nitdroid files, and then repartitioned. I recreated the partitions I'd deleted, and untarred the files back into them. However, none of my OS's boot anymore. I verified that the partition numbers are still the same (i.e. rootfs is on /dev/mmcblk0p3), and now I don't know what to do. All the files are there, the permissions are the same as they used to be, and the partitions are the same - what am I missing?