Error mounting /dev/sdb2, wrong fs type, bad option, bad superblock on /dev/sdb2

ashangel · 07-25-2012, 03:34 AM

Hi,
I have a 1 GB compact flash drive which is divided in to two partitions.
When I insert CF, partition1 mounts correctly showing the contents.

However, partition2 doesnt mount, gaves following error:

[root@ash ~]# mount /dev/sdb2 /mnt/cf2
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
[root@ash ~]#

I did dmesg, got the following:
[ 8079.980702] sd 7:0:0:0: [sdb] Attached SCSI removable disk
[ 8080.376894] SELinux: initialized (dev sdb1, type vfat), uses genfs_contexts
[ 8080.378993] EXT4-fs (sdb2): mounting ext3 file system using the ext4 subsystem
[ 8080.443187] EXT4-fs (sdb2): mounted filesystem with ordered data mode. Opts: (null)
[ 8080.443205] SELinux: initialized (dev sdb2, type ext3), uses xattr
[ 8762.791409] EXT4-fs error (device sdb2): ext4_map_blocks:491: inode #2: block 512: comm ls: lblock 0 mapped to illegal pblock (length 1)
[ 8772.921186] EXT4-fs error (device sdb2): ext4_map_blocks:491: inode #2: block 512: comm pool: lblock 0 mapped to illegal pblock (length 1)
[ 8777.913372] EXT4-fs error (device sdb2): ext4_map_blocks:491: inode #2: block 512: comm pool: lblock 0 mapped to illegal pblock (length 1)
[ 8781.056920] EXT4-fs error (device sdb2): ext4_map_blocks:491: inode #2: block 512: comm pool: lblock 0 mapped to illegal pblock (length 1)
[ 8805.949750] EXT4-fs error (device sdb2): ext4_map_blocks:491: inode #2: block 512: comm pool: lblock 0 mapped to illegal pblock (length 1)
[ 8816.091232] EXT4-fs error (device sdb2): ext4_map_blocks:491: inode #2: block 512: comm ls: lblock 0 mapped to illegal pblock (length 1)
[ 8844.117868] EXT4-fs error (device sdb2): ext4_map_blocks:491: inode #2: block 512: comm pool: lblock 0 mapped to illegal pblock (length 1)
[ 8846.833007] EXT4-fs error (device sdb2): ext4_map_blocks:491: inode #2: block 512: comm pool: lblock 0 mapped to illegal pblock (length 1)
[ 9011.048591] sdb: detected capacity change from 1014644736 to 0
[ 9018.128030] usb 2-1.2: USB disconnect, device number 6

Any help please??

John VV · 07-26-2012, 04:04 PM

what operating system is this ??
from the "SELinux" part i am GUESSING
RHEL5
RHEL6
Fedora16
Fedora17
CentOS6.3
SL6.2
any others are unsupported

also WHAT operating system MADE the flash drive?
windows 7?Vista? xp?
or
an Apple Mac ?

off hand i would GUESS that sdb2 is NTFS if windows was used

" mount /dev/sdb2 /mnt/cf2 "
also unless YOU have this IN your fstab file
you NEED to add the type of partition this is

Code:

 mount -t vfat /dev/sdb2 /mnt/cf2
-----
 mount -t ntfs-3g /dev/sdb2 /mnt/cf2
---------------
 mount -t ext3 /dev/sdb2 /mnt/cf2

Karl Godt · 07-28-2012, 08:59 PM

Code:

fsck -v -f /dev/sdb2

ashangel · 08-06-2012, 03:41 AM

Quote:

Originally Posted by John VV

what operating system is this ??
from the "SELinux" part i am GUESSING
RHEL5
RHEL6
Fedora16
Fedora17
CentOS6.3
SL6.2
any others are unsupported

also WHAT operating system MADE the flash drive?
windows 7?Vista? xp?
or
an Apple Mac ?

off hand i would GUESS that sdb2 is NTFS if windows was used

" mount /dev/sdb2 /mnt/cf2 "
also unless YOU have this IN your fstab file
you NEED to add the type of partition this is

Code:

 mount -t vfat /dev/sdb2 /mnt/cf2
-----
 mount -t ntfs-3g /dev/sdb2 /mnt/cf2
---------------
 mount -t ext3 /dev/sdb2 /mnt/cf2

Its fedora 17 and the same OS has built the cf.

I have found the error I made that caused the problem.
I did:
cp mycode /dev/sdb2

instead of:

cp mycode /mnt/cf2

anyhow, I used the cfsk utility and it solved the problem.

Thanks