I'm trying to follow RomanG's instructions in this thread: http://www.raspberrypi.org/forums/viewtopic.php?f=91&t=19468 on the Raspberry Pi Forums in order to shrink a Raspbian Image to fit on a smaller SD card.
I've already uninstalled a bunch of stuff and shrunk the partition using GParted. All that is good and I've created an image using
dd that I've mounted using
When I run
fdisk -l on
/dev/loop0 I get the following which also all looks good.
$ sudo fdisk -l /dev/loop0 Disk /dev/loop0: 4124 MB, 4124049408 bytes 255 heads, 63 sectors/track, 501 cylinders, total 8054784 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000b5098 Device Boot Start End Blocks Id System /dev/loop0p1 8192 122879 57344 6 FAT16 /dev/loop0p2 122880 3706879 1792000 83 Linux
I want to shrink the image to match that used by the actual partitions in the image, but when I run
f2resize I get the following error:
$ sudo resize2fs -p /dev/loop0p2 3706880 resize2fs 1.42 (29-Nov-2011) The containing partition (or device) is only 448000 (4k) blocks. You requested a new size of 3706880 blocks. dan@danDevU:~/Desktop$ sudo resize2fs -p /dev/loop0 3706880 resize2fs 1.42 (29-Nov-2011) resize2fs: Bad magic number in super-block while trying to open /dev/loop0 Couldn't find valid filesystem superblock.
Checking the image for errors gives what looks like a similar error:
$ sudo e2fsck -f /dev/loop0 e2fsck 1.42 (29-Nov-2011) e2fsck: Superblock invalid, trying backup blocks... e2fsck: Bad magic number in super-block while trying to open /dev/loop0 The superblock could not be read or does not describe a correct ext2 filesystem. If the device is valid and it really contains an ext2 filesystem (and not swap or ufs or something else), then the superblock is corrupt, and you might try running e2fsck with an alternate superblock: e2fsck -b 8193 <device>
Any ideas how I can sort this?
I need to create an image that will fit on a 2GB SD card, and I've managed to squeeze everything down to do that - other than the image itself.
(Note: I am trying to shrink the image on a Ubuntu 12.04 box. This is the same box that I used to dd the image off the SD card)