Try the poorly-named "testdisk" to see if it can get any of the old partition information. I've had good luck with recovering accidentally-partitioned disks. On Wed, Feb 12, 2014 at 11:39 AM, Robert P. J. Day <rpjday@xxxxxxxxxxxxxx> wrote: > > a friend asks me if there's a way to solve the following, not out of > any sense of urgency (since there are backups) but more out of a sense > of curiosity as to whether it can even be done. > > long story short, a 750G drive which *used* to be the primary drive > in a laptop was replaced with a newer drive, and the older drive was > reassigned to be the secondary drive, /dev/sdb. in order to > occasionally copy stuff from the old home directory, this entry was > added to /etc/fstab on the new system: > > /dev/vg1/home /opt/home ext4 defaults 1 2 > > so that (obviously) what used to be the "home" logical volume in the > old "vg1" volume group appeared under /opt/home, and was available for > the occasional restoration of old content. > > problem: person was trying to write a 2G bootable (embedded Linux) > image to an inserted USB drive and, rather than writing to /dev/sdc > (the USB drive), "dd"ed to /dev/sdb instead, overwriting the first 2G > of the secondary hard drive and, with it, whatever LSM content resided > in that first 2G. > > i have the drive connected to my fedora 20 laptop as /dev/sdb and, > sure enough: > > $ sudo fdisk -l /dev/sdb > > Disk /dev/sdb: 698.7 GiB, 750156374016 bytes, 1465149168 sectors > Units: sectors of 1 * 512 = 512 bytes > Sector size (logical/physical): 512 bytes / 4096 bytes > I/O size (minimum/optimal): 4096 bytes / 4096 bytes > Disklabel type: dos > Disk identifier: 0x00000000 > > Device Boot Start End Blocks Id System > /dev/sdb1 * 2048 198655 98304 e W95 FAT16 (LBA) > /dev/sdb2 198656 3481599 1641472 83 Linux > $ > > so while the physical disk correctly shows up as almost 700G, the > partition table has been replaced by the one from the embedded image, > rendering the rest of the hard drive inaccessible. > > is there any utility that will scan the drive beyond what is > referenced by the partition table and try to identify valid logical > volumes? i don't know anything offhand, so i'm open to suggestions. > thanks. > > rday > > -- > > ======================================================================== > Robert P. J. Day Ottawa, Ontario, CANADA > http://crashcourse.ca > > Twitter: http://twitter.com/rpjday > LinkedIn: http://ca.linkedin.com/in/rpjday > ======================================================================== > -- > users mailing list > users@xxxxxxxxxxxxxxxxxxxxxxx > To unsubscribe or change subscription options: > https://admin.fedoraproject.org/mailman/listinfo/users > Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct > Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines > Have a question? Ask away: http://ask.fedoraproject.org -- Team Amiga New Jersey - The less that I speak, the smarter I sound. -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
