Thread: Gparted move/resize ext4... invalid superblock

i trying rearrange partitions using gparted free space in usable place.

shrank second partition , clicked apply. finished successfully.

tried expand third partition downwards. sait take 90 minutes, went bed.

when came back, screen showed had stopped in kind of boot state. rebooted , found keyboard didn't work in xorg. 2 cold boots later , magically worked again.

expanded partition had not mounted loaded gparted again , got "unable detect filesystem" on partition.

emyr@emyr-desktop:~$ sudo mke2fs -n /dev/sdb3
mke2fs 1.41.14 (22-dec-2010)
filesystem label=
os type: linux
block size=4096 (log=2)
fragment size=4096 (log=2)
stride=0 blocks, stripe width=0 blocks
23707648 inodes, 94823304 blocks
4741165 blocks (5.00%) reserved super user
first data block=0
maximum filesystem blocks=0
2894 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968

emyr@emyr-desktop:~$

emyr@emyr-desktop:~$ sudo fdisk -l
[sudo] password emyr:

disk /dev/sda: 160.0 gb, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
units = cylinders of 16065 * 512 = 8225280 bytes
sector size (logical/physical): 512 bytes / 512 bytes
i/o size (minimum/optimal): 512 bytes / 512 bytes
disk identifier: 0x24bf24be

device boot start end blocks id system
/dev/sda1 1 5992 48130708+ 7 hpfs/ntfs
/dev/sda2 5993 15722 78156225 7 hpfs/ntfs

disk /dev/sdb: 500.1 gb, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
units = cylinders of 16065 * 512 = 8225280 bytes
sector size (logical/physical): 512 bytes / 512 bytes
i/o size (minimum/optimal): 512 bytes / 512 bytes
disk identifier: 0xe5f3ed43

device boot start end blocks id system
/dev/sdb1 * 1 7012 56319952+ 83 linux
partition 1 not end on cylinder boundary.
/dev/sdb2 7208 13582 51200588+ 83 linux
/dev/sdb3 13582 60801 379293216+ 83 linux
/dev/sdb4 7012 7207 1570243+ 82 linux swap / solaris

partition table entries not in disk order

disk /dev/sdc: 250.1 gb, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
units = cylinders of 16065 * 512 = 8225280 bytes
sector size (logical/physical): 512 bytes / 512 bytes
i/o size (minimum/optimal): 512 bytes / 512 bytes
disk identifier: 0x000b717b

device boot start end blocks id system
/dev/sdc1 1 6527 52426752 6 fat16
/dev/sdc2 6528 30401 191767905 0 empty
emyr@emyr-desktop:~$

i googled bit , read backup superblocks, tried this:

emyr@emyr-desktop:~$ sudo e2fsck -b 163840 /dev/sdb3
e2fsck 1.41.14 (22-dec-2010)
e2fsck: bad magic number in super-block while trying open /dev/sdb3

superblock not read or not describe correct ext2
filesystem. if device valid , contains ext2
filesystem (and not swap or ufs or else), superblock
corrupt, , might try running e2fsck alternate superblock:
e2fsck -b 8193 <device&gt;

emyr@emyr-desktop:~$

what should next step?

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