EXT2-fs error

mount /dev/sda1 /mnt/usb
mount: wrong fs type, bad option, bad superblock on /dev/sda1,
missing codepage or other error
In some cases useful info is found in syslog - try
dmesg | tail or so

:~# dmesg | tail
EXT2-fs error (device sda1): ext2_check_descriptors: Inode table for group 512 n ot in group (block 0)!
EXT2-fs: group descriptors corrupted!

насколько это смертельно? как лечить?
можно ли спасти данные?

нет, не помогает ....
запустил fsck -t ext3 -vy /dev/sda1

бежит типовая строка:
Inode 4112962, i_blocks is 4084008057, should be 0. Fix? yes

и вот еще

Illegal block #0 (2090865518) in inode 4113048. CLEARED.
Illegal block #1 (3242735728) in inode 4113048. CLEARED.
Illegal block #2 (428011453) in inode 4113048. CLEARED.
Illegal block #3 (2852855363) in inode 4113048. CLEARED.
Illegal block #4 (3416368975) in inode 4113048. CLEARED.
Illegal block #5 (3305796742) in inode 4113048. CLEARED.
Illegal block #6 (4190621636) in inode 4113048. CLEARED.
Illegal block #7 (492497867) in inode 4113048. CLEARED.
Illegal block #8 (2658597995) in inode 4113048. CLEARED.
Illegal block #9 (818258637) in inode 4113048. CLEARED.
Illegal block #10 (3219974743) in inode 4113048. CLEARED.
Too many illegal blocks in inode 4113048.

да, вообще изначально был ext3 , до сбоя...

обычный IDE -диск .... в USB - коробке ..... случайно отшел "хлибкий" шнурик внешнего питания ...

далее диск не монтируетя ... ес-сно сразу fsck... и вот результат

arvdr:~# fsck -t ext2 -c /dev/sda1
fsck 1.37 (21-Mar-2005)
e2fsck 1.37 (21-Mar-2005)
Group descriptors look bad... trying backup blocks...
Inode table for group 512 is not in group. (block 0)
WARNING: SEVERE DATA LOSS POSSIBLE.
Relocate<y>? yes

Inode table for group 561 is not in group. (block 0)
WARNING: SEVERE DATA LOSS POSSIBLE.
Relocate<y>? yes

Inode table for group 760 is not in group. (block 0)
WARNING: SEVERE DATA LOSS POSSIBLE.
Relocate<y>? yes

Inode table for group 2050 is not in group. (block 0)
WARNING: SEVERE DATA LOSS POSSIBLE.
Relocate<y>? yes

fsck.ext2: e2fsck_read_bitmaps: illegal bitmap block(s) for data

пожалуй, ты прав ...увы
прогоню mke2fs -j , хотя есть жалание узнать о причине уязвимости "нерушимого" ext3 .. но видимо не судьба.