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partition table has been replaced by the one from the embedded image,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
========================================================================
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