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Old 10-04-2010, 12:38 PM
loody
 
Default how to save back partition table

Dear all:
I accidentally dd about 7MBytes to /dev/sda1, and it cause my HD
cannot be recognized by ubuntu.
Is there any way to save it back, no matter use any tool under XP or ubuntu?
appreciate your help,
miloody

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Old 10-04-2010, 03:07 PM
Franz Waldmüller
 
Default how to save back partition table

Hi loody,
loody wrote:
> Dear all:
> I accidentally dd about 7MBytes to /dev/sda1, and it cause my HD
> cannot be recognized by ubuntu.
> Is there any way to save it back, no matter use any tool under XP or ubuntu?
> appreciate your help,
> miloody
>
check out the tools gpart and testdisk


http://www.mohdshakir.net/2008/01/03/recover-lost-partition-table-using-ubuntu-live-cd-gpart
Before doing any further configurations you should backup your hard disk.

#apt-cache show gpart
Package: gpart
Priority: optional
Section: universe/admin
Installed-Size: 108
Maintainer: Ubuntu MOTU Developers <ubuntu-motu@lists.ubuntu.com>
Original-Maintainer: Debian Forensics
<forensics-devel@lists.alioth.debian.org>
Architecture: i386
Version: 0.1h-9
Depends: libc6 (>= 2.4)
Filename: pool/universe/g/gpart/gpart_0.1h-9_i386.deb
Size: 38426
MD5sum: f9a1376e579f2b65738221199d9f3d43
SHA1: 8d4f61951016ac4fc25e8bfdb52de4538c30fbb7
SHA256: 2b8cdeb359f8707526aa0e7d8916b49830e1635fbf8fec5a06 9a40ac3eae92d1
Description: Guess PC disk partition table, find lost partitions
Gpart is a tool which tries to guess the primary partition table of a
PC-type
disk in case the primary partition table in sector 0 is damaged,
incorrect or
deleted.
.
It is also good at finding and listing the types, locations, and sizes of
inadvertently-deleted partitions, both primary and logical. It gives
you the
information you need to manually re-create them (using fdisk, cfdisk,
sfdisk,
etc.).
.
The guessed table can also be written to a file or (if you firmly
believe the
guessed table is entirely correct) directly to a disk device.
.
Currently supported (guessable) filesystem or partition types:
.
* BeOS filesystem type.
* FreeBSD/NetBSD/386BSD disklabel sub-partitioning scheme used on Intel
platforms.
* Linux second extended filesystem.
* MS-DOS FAT12/16/32 "filesystems".
* IBM OS/2 High Performance filesystem.
* Linux LVM physical volumes (LVM by Heinz Mauelshagen).
* Linux swap partitions (versions 0 and 1).
* The Minix operating system filesystem type.
* MS Windows NT/2000 filesystem.
* QNX 4.x filesystem.
* The Reiser filesystem (version 3.5.X, X > 11).
* Sun Solaris on Intel platforms uses a sub-partitioning scheme on PC
hard
disks similar to the BSD disklabels.
* Silicon Graphics' journalling filesystem for Linux.
Homepage: http://home.pages.de/~michab/gpart/
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Origin: Ubuntu

----------------------------

#apt-cache show testdisk
Package: testdisk
Priority: optional
Section: universe/admin
Installed-Size: 4672
Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
Original-Maintainer: Jean-Michel Kelbert <kelbert@debian.org>
Architecture: i386
Version: 6.11-1
Depends: e2fslibs (>= 1.41.0), libc6 (>= 2.7), libcomerr2 (>= 1.01),
libjpeg62, libncursesw5 (>= 5.6+20071006-3), libntfs10 (>= 2.0.0),
libuuid1 (>= 1.05)
Filename: pool/universe/t/testdisk/testdisk_6.11-1_i386.deb
Size: 1546936
MD5sum: d47c7bc23b630b832c78983b8deb0f6a
SHA1: ec0e0dea2e5df1d4d525e6c9fe06aff74c1a6236
SHA256: 55fc39e294f6e20aea65c2cf22e9b5636d18ce9aef0571f8b1 56d1548588ee90
Description: Partition scanner and disk recovery tool
TestDisk checks the partition and boot sectors of your disks.
It is very useful in recovering lost partitions.
It works with :
* DOS/Windows FAT12, FAT16 and FAT32
* NTFS ( Windows NT/2K/XP )
* Linux Ext2 and Ext3
* BeFS ( BeOS )
* BSD disklabel ( FreeBSD/OpenBSD/NetBSD )
* CramFS (Compressed File System)
* HFS and HFS+, Hierarchical File System
* JFS, IBM's Journaled File System
* Linux Raid
* Linux Swap (versions 1 and 2)
* LVM and LVM2, Linux Logical Volume Manager
* Netware NSS
* ReiserFS 3.5 and 3.6
* Sun Solaris i386 disklabel
* UFS and UFS2 (Sun/BSD/...)
* XFS, SGI's Journaled File System



Wish you luck!
Franz

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Old 10-04-2010, 05:18 PM
NoOp
 
Default how to save back partition table

On 10/04/2010 05:38 AM, loody wrote:
> Dear all:
> I accidentally dd about 7MBytes to /dev/sda1, and it cause my HD
> cannot be recognized by ubuntu.
> Is there any way to save it back, no matter use any tool under XP or ubuntu?
> appreciate your help,
> miloody
>

dd it back from a liveCD?

In addition to what Franz provided:
https://help.ubuntu.com/community/DataRecovery
http://manpages.ubuntu.com/manpages/lucid/man8/fdisk.8.html
http://manpages.ubuntu.com/manpages/lucid/man8/cfdisk.8.html



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