Unable to mount USB external enclosue


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Thread: Unable to mount USB external enclosue

  1. #1
    Join Date
    Jul 2003
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    Unable to mount USB external enclosue

    Hi all,

    Ubuntu 12.04 desktop 64bit

    For unknown reason the USB external enclosue fails to mount automatically.

    Warning:
    Code:
    Error mounting: mount: wrong fs type, bad option, bad superblock on /dev/sdc1,
           missing codepage or helper program, or other error
           In some cases useful info is found in syslog - try
           dmesg | tail  or so
    $ dmesg | tail
    Code:
    [   79.774909] sd 3:0:0:0: [sdc] Assuming drive cache: write through
    [   79.774915] sd 3:0:0:0: [sdc] Attached SCSI disk
    [   80.255406] EXT2-fs (sdc1): error: ext2_check_descriptors: Block bitmap for group 1794 not in group (block 59244544)!
    [   80.255415] EXT2-fs (sdc1): group descriptors corrupted
    [  184.852511] EXT2-fs (sdc1): error: ext2_check_descriptors: Block bitmap for group 1794 not in group (block 59244544)!
    [  184.852520] EXT2-fs (sdc1): group descriptors corrupted
    [  532.463987] EXT2-fs (sdc1): error: ext2_check_descriptors: Block bitmap for group 1794 not in group (block 59244544)!
    [  532.463997] EXT2-fs (sdc1): group descriptors corrupted
    [  683.677289] EXT2-fs (sdc1): error: ext2_check_descriptors: Block bitmap for group 1794 not in group (block 59244544)!
    [  683.677299] EXT2-fs (sdc1): group descriptors corrupted
    $ sudo fdisk -l
    Code:
    ....
    ....
    Disk /dev/sdc: 640.1 GB, 640135028736 bytes
    255 heads, 63 sectors/track, 77825 cylinders, total 1250263728 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: 0x00083ffc
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sdc1            2048  1250263039   625130496   83  Linux

    Tried to mount it manually without success. There is only one partition on the HD

    $ sudo mount -t ext2 /dev/sdc1 /mnt
    Code:
    mount: wrong fs type, bad option, bad superblock on /dev/sdc1,
           missing codepage or helper program, or other error
           In some cases useful info is found in syslog - try
           dmesg | tail  or so
    $ dmesg | tail
    Code:
    [  532.463987] EXT2-fs (sdc1): error: ext2_check_descriptors: Block bitmap for group 1794 not in group (block 59244544)!
    [  532.463997] EXT2-fs (sdc1): group descriptors corrupted
    [  683.677289] EXT2-fs (sdc1): error: ext2_check_descriptors: Block bitmap for group 1794 not in group (block 59244544)!
    [  683.677299] EXT2-fs (sdc1): group descriptors corrupted
    [ 1116.031557] EXT3-fs (sdc): error: can't find ext3 filesystem on dev sdc.
    [ 1116.081689] EXT4-fs (sdc): VFS: Can't find ext4 filesystem
    [ 1116.169356] EXT2-fs (sdc): error: can't find an ext2 filesystem on dev sdc.
    [ 1133.983241] EXT2-fs (sdc): error: can't find an ext2 filesystem on dev sdc.
    [ 1145.519512] EXT2-fs (sdc1): error: ext2_check_descriptors: Block bitmap for group 1794 not in group (block 59244544)!
    [ 1145.519521] EXT2-fs (sdc1): group descriptors corrupted
    Please help. TIA

    satimis

  2. #2
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    Look like the hard disk is on its way out.

    When a corruption starts it takes longer to read/write, then delays, then disk refuses to mount and finally cannot be read (failed to register in the Bios).

    However a poor connection can also cause difficulty in accessing the disk.

    Time to try a different cable and then a different operating system. If the data is valuable the content should be cloned now using dd which copies the data at a hardware level without the need of knowing/using its filing system (sector-by-sector copying the binary bits). dd will not work if the hardware cannot be found from the Bios.
    Linux user started Jun 2004 - No. 361921
    Using a Linux live CD to clone XP
    To install Linux and keep Windows MBR untouched
    Adding extra Linux & Doing it in a lazy way
    A Grub menu booting 100+ systems & A "Howto" to install and boot 145 systems
    Just cloning tips Just booting tips A collection of booting tips

    Judge asked Linux "You are being charged murdering Windoze by stabbing its heart with a weapon, what was it?" Replied Linux "A Live CD"

  3. #3
    Join Date
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    Quote Originally Posted by saikee View Post
    Look like the hard disk is on its way out.

    When a corruption starts it takes longer to read/write, then delays, then disk refuses to mount and finally cannot be read (failed to register in the Bios).

    However a poor connection can also cause difficulty in accessing the disk.

    Time to try a different cable and then a different operating system. If the data is valuable the content should be cloned now using dd which copies the data at a hardware level without the need of knowing/using its filing system (sector-by-sector copying the binary bits). dd will not work if the hardware cannot be found from the Bios.
    Before reading your posting, have performed following steps;

    $ sudo file -s /dev/sdc1
    Code:
    /dev/sdc1: Linux rev 0.0 ext2 filesystem data (mounted or unclean), UUID=00000000-0000-0000-0000-000000000000 (errors)
    $ sudo fsck /dev/sdc1
    Code:
    fsck from util-linux 2.20.1
    e2fsck 1.42 (29-Nov-2011)
    fsck.ext2: Group descriptors look bad... trying backup blocks...
    /dev/sdc1 was not cleanly unmounted, check forced.
    Pass 1: Checking inodes, blocks, and sizes
    Inode 15409156 has a extra size (33204) which is invalid
    Fix<y>? yes
    
    Inode 15409157 has a extra size (33204) which is invalid
    Fix<y>? yes
    ...
    ....
    .....
    Illegal block #8 (1357702771) in inode 20021469.  CLEARED.
    Illegal block #9 (1356956940) in inode 20021469.  CLEARED.
    Illegal block #10 (1333111983) in inode 20021469.  CLEARED.
    Illegal block #813 (1397638477) in inode 20021469.  CLEARED.
    Illegal block #830 (1229799685) in inode 20021469.  CLEARED.
    Illegal block #831 (1478512460) in inode 20021469.  CLEARED.
    Illegal block #832 (892477545) in inode 20021469.  CLEARED.
    Illegal block #896 (1247102468) in inode 20021469.  CLEARED.
    Illegal block #897 (1431524425) in inode 20021469.  CLEARED.
    Illegal block #898 (1162433312) in inode 20021469.  CLEARED.
    Illegal block #899 (1397638477) in inode 20021469.  CLEARED.
    Too many illegal blocks in inode 20021469.
    Clear inode<y>? yes
    hanging here for >20min

    Code:
    Restarting e2fsck from the beginning...
    /dev/sdc1 was not cleanly unmounted, check forced.
    Pass 1: Checking inodes, blocks, and sizes
    
    Restarting e2fsck from the beginning...
    /dev/sdc1 was not cleanly unmounted, check forced.
    Pass 1: Checking inodes, blocks, and sizes
    Pass 2: Checking directory structure
    Entry 'Transfer_Directory' in / (2) has deleted/unused inode 15409153.  Clear<y>? yes
    
    Entry 'Inland_Revenue' in /Satimis_Document/Old_n_New_Documents_20121228/Documents_from_20100614_20130109/Doc_Personal_20100614_20130109/Personal_20100614_20130109 (19947693) has deleted/unused inode 20021458.  Clear<y>? yes
    ....
    ....
    Pass 3: Checking directory connectivity
    Pass 3A: Optimizing directories
    
    Pass 4: Checking reference counts
    Inode 2 ref count is 8, should be 7.  Fix<y>? yes
    
    Inode 19947693 ref count is 23, should be 21.  Fix<y>? 
    
    Pass 4: Checking reference counts
    Inode 2 ref count is 8, should be 7.  Fix<y>? yes
    
    Inode 19947693 ref count is 23, should be 21.  Fix<y>? yes
    
    Inode 19980322 ref count is 7, should be 6.  Fix<y>? yes
    
    Unattached inode 32235521
    Connect to /lost+found<y>? yes
    
    Inode 32235521 ref count is 2, should be 1.  Fix<y>? 
    
    Pass 5: Checking group summary information
    Block bitmap differences:  +(29360128--29360575) -61659136 -(61659139--61659140) -(61659142--61659143) -(79939743--79939747) -79943680 -79945728 -(79947776--79947959) -79951872 -(80097145--80097849)
    Fix<y>? yes
    
    Free blocks count wrong for group #0 (31223, counted=0).
    Fix<y>? yes
    .....
    .....
    
    /dev/sdc1: ***** FILE SYSTEM WAS MODIFIED *****
    /dev/sdc1: 41839/39075840 files (0.4% non-contiguous), 125969438/156282624 block
    
    satimis@localhost:~$
    Switched off the USB external enclosure and then switched it on again

    The USB external enclosure was connected automatically. However some newly saved files and directory have been deleted.

    Is there anyway to recover them?

    Besides:
    This USB external enclosure and HD (Seagate SATA 640G) have been used for sometime. I'm prepared replacing it with either an Exteral HD or NAS (1TB). It is for home use. Which device would you recommended?

    TIA

    satimis

  4. #4
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    For deleted files recovery have a look at the Trash folder.

    prepared replacing it with either an Exteral HD or NAS (1TB). It is for home use. Which device would you recommended?
    This really depends on its usage and the capability of the equipment.

    For example if the access is infrequent and a large volume of data needed to be moved then buying a USB3 adpator and a USB3 enclosure will give you the fastest data transfer time especially if the NAS has a slow speed in hard disk read/write.

    However if you need the data in a small amouint frequently, like playing Mp3 music, then put it on a NAS is more convenient.
    Only you can tell what would be the best arrangement.
    Linux user started Jun 2004 - No. 361921
    Using a Linux live CD to clone XP
    To install Linux and keep Windows MBR untouched
    Adding extra Linux & Doing it in a lazy way
    A Grub menu booting 100+ systems & A "Howto" to install and boot 145 systems
    Just cloning tips Just booting tips A collection of booting tips

    Judge asked Linux "You are being charged murdering Windoze by stabbing its heart with a weapon, what was it?" Replied Linux "A Live CD"

  5. #5
    Join Date
    Jul 2003
    Posts
    2,021
    Quote Originally Posted by saikee View Post
    For deleted files recovery have a look at the Trash folder.
    I can't discover them there.

    This really depends on its usage and the capability of the equipment.

    For example if the access is infrequent and a large volume of data needed to be moved then buying a USB3 adpator and a USB3 enclosure will give you the fastest data transfer time especially if the NAS has a slow speed in hard disk read/write.

    However if you need the data in a small amouint frequently, like playing Mp3 music, then put it on a NAS is more convenient.
    Only you can tell what would be the best arrangement.
    "However if you need the data in a small amouint frequently..." That is what I need

    Actually the USB external enclosure is for temporary storage only. I have 2 PCs connected via router, not running at the same time.

    - working on PC-1
    I'll save the working files on PC-1 with copies to the USB external enclosure

    - working on PC-2
    Download the files on the USB external enclosure. After working save the files on PC-2 with copies to USB external enclosure.

    and so on. In this arrangement I retain the complete data on both PC-1 and PC-2

    I'm considering leaving out the USB external enclosure, saving the files direct PC to PC. I'll turn on another PC when saving files.

    Any suggestion? TIA

    satimis

  6. #6
    Join Date
    Jun 2004
    Location
    Newcastle upon Tyne
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    Go NAS. Put a master copy there. Every copy of the same file you have on the PC can be ditched and regarded temporary. Back up only the master copy of NAS which can be switched on whenever you need.
    Linux user started Jun 2004 - No. 361921
    Using a Linux live CD to clone XP
    To install Linux and keep Windows MBR untouched
    Adding extra Linux & Doing it in a lazy way
    A Grub menu booting 100+ systems & A "Howto" to install and boot 145 systems
    Just cloning tips Just booting tips A collection of booting tips

    Judge asked Linux "You are being charged murdering Windoze by stabbing its heart with a weapon, what was it?" Replied Linux "A Live CD"

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