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Unrecognized disk label of a external HD

 
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# 1  
Old 11-12-2010
Unrecognized disk label of a external HD

I have a external HD that I can't seem to open. When I try to open it with gparted it says unrecognized disk. When I run gparted from the terminal this is what it says.

Code:
~ $ sudo gparted
======================
libparted : 2.2
======================
/dev/sdb: unrecognised disk label

When I run the fdisk command this is what it says.

Code:
~ $ sudo fdisk -l

Disk /dev/sda: 100.0 GB, 100030242816 bytes
255 heads, 63 sectors/track, 12161 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: 0x000c8b89

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1        1245     9999360   83  Linux
/dev/sda2            1246        5478    33998849    5  Extended
/dev/sda3   *        5479       12161    53681197+   7  HPFS/NTFS
/dev/sda5            1246        1743     3998720   82  Linux swap / Solaris
/dev/sda6            1744        5478    29999104   83  Linux

Disk /dev/sdb: 203.9 GB, 203928109056 bytes
255 heads, 63 sectors/track, 24792 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: 0x00000000

Disk /dev/sdb doesn't contain a valid partition table

# 2  
Old 11-12-2010
Might be that the disk label has not been initialized yet. Is this a new disk, or has it been used before? If it's already been used: under which OS and version?
# 3  
Old 11-12-2010
I also get this message when I try to mount the HD. I tried with and without the force option.

Code:
~ $ sudo mount -t ntfs-3g /dev/sdb /media/hd-ntfs -o force
NTFS signature is missing.
Failed to mount '/dev/sdb': Invalid argument
The device '/dev/sdb' doesn't seem to have a valid NTFS.
Maybe the wrong device is used? Or the whole disk instead of a
partition (e.g. /dev/sda, not /dev/sda1)? Or the other way around?

~ $ sudo mount -t ntfs-3g /dev/sdb /media/hd-ntfs
NTFS signature is missing.
Failed to mount '/dev/sdb': Invalid argument
The device '/dev/sdb' doesn't seem to have a valid NTFS.
Maybe the wrong device is used? Or the whole disk instead of a
partition (e.g. /dev/sda, not /dev/sda1)? Or the other way around?

---------- Post updated at 04:57 AM ---------- Previous update was at 04:55 AM ----------

Quote:
Originally Posted by pludi
Might be that the disk label has not been initialized yet. Is this a new disk, or has it been used before? If it's already been used: under which OS and version?
It has a NTFS partition. I use it in both windows xp and Linux Mint which is very similar to Ubuntu.
# 4  
Old 11-12-2010
Is it a Western Digital unit?
what specific OS are you trying to mount it on?
# 5  
Old 11-12-2010
Quote:
Originally Posted by fpmurphy
Is it a Western Digital unit?
what specific OS are you trying to mount it on?
No its Maxtor.

Linux Mint and Windows XP. Neither can open it.
# 6  
Old 11-12-2010
Clearly the boot sector's been stomped on somehow at the very least.

Try sudo dd if=/dev/sdb count=$((2*16384)) | hexdump -C | less which should show a binary dump of the first sixteen megs of the drive. Hunt for NTFS in that listing in less by typing "/NTFS" and hitting enter. If it finds it that means the partition might still exist and might still be accessible if you can create a partition on the disk matching it's exact placement.
# 7  
Old 11-12-2010
Quote:
Originally Posted by Corona688
Clearly the boot sector's been stomped on somehow at the very least.

Try sudo dd if=/dev/sdb count=$((2*16384)) | hexdump -C | less which should show a binary dump of the first sixteen megs of the drive. Hunt for NTFS in that listing in less by typing "/NTFS" and hitting enter. If it finds it that means the partition might still exist and might still be accessible if you can create a partition on the disk matching it's exact placement.
I saw it a few times. How would I pipe that in a log file? Less keeps on getting stuck on me when I try to search. This is the command I used and it just made a empty log file.
Code:
sudo dd if=/dev/sdb count=$((2*16384)) | hexdump -C | > /home/bob/Desktop/lspci

Since I do see NTFS how would I fix it?

---------- Post updated at 02:10 PM ---------- Previous update was at 01:59 PM ----------

I also found this and this looks promising Smilie.
Code:
00007f80  eb f2 c3 0d 0a 41 20 64  69 73 6b 20 72 65 61 64  |.....A disk read|
00007f90  20 65 72 72 6f 72 20 6f  63 63 75 72 72 65 64 00  | error occurred.|
00007fa0  0d 0a 4e 54 4c 44 52 20  69 73 20 6d 69 73 73 69  |..NTLDR is missi|
00007fb0  6e 67 00 0d 0a 4e 54 4c  44 52 20 69 73 20 63 6f  |ng...NTLDR is co|
00007fc0  6d 70 72 65 73 73 65 64  00 0d 0a 50 72 65 73 73  |mpressed...Press|
00007fd0  20 43 74 72 6c 2b 41 6c  74 2b 44 65 6c 20 74 6f  | Ctrl+Alt+Del to|
00007fe0  20 72 65 73 74 61 72 74  0d 0a 00 00 00 00 00 00  | restart........|
00007ff0  00 00 00 00 00 00 00 00  83 a0 b3 c9 00 00 55 aa  |..............U.|
00008000  05 00 4e 00 54 00 4c 00  44 00 52 00 04 00 24 00  |..N.T.L.D.R...$.|
00008010  49 00 33 00 30 00 00 e0  00 00 00 30 00 00 00 00  |I.3.0......0....|


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