Oшибка суперблока

Device Boot Start End Blocks Id System
/dev/sda1 * 16128 41608349 20796111 7 HPFS/NTFS/exFAT
/dev/sda2 41608350 156296384 57344017+ 7 HPFS/NTFS/exFAT
Warning: ignoring extra data in partition table 6
omitting empty partition (5)
omitting empty partition (6)

Disk /dev/sdb: 250.1 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders, total 488397168 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: 0x8d093064

Device Boot Start End Blocks Id System
/dev/sdb1 2048 55683688 27840820+ 83 Linux
/dev/sdb2 55685118 80844799 12579841 5 Extended
/dev/sdb3 72458240 80844799 4193280 82 Linux swap / Solaris
/dev/sdb4 * 80855145 291708269 105426562+ b W95 FAT32
/dev/sdb5 55685120 64067583 4191232 82 Linux swap / Solaris

Disk /dev/sdc: 8020 MB, 8020551680 bytes
247 heads, 62 sectors/track, 1022 cylinders, total 15665140 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: 0x00049871

Device Boot Start End Blocks Id System
/dev/sdc1 * 62 15650907 7825423 b W95 FAT32

# mount -t ext4 /dev/sdb2 /mnt
mount: wrong fs type, bad option, bad superblock on /dev/sdb2,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so