11-28-2009
Corrupted Hard Drive
I am running FC-7 which I realize is an older distro. But my question would apply to any distro.
I ran fsck on my mounted file system (I know, I shouldn't have). Now it won't boot. I get a kernel panic message.
I booted to a Knoppix Live Cd.
The desktop icon shows /dev/sda2 mounted at /media/sda2. When I perform ls -l on /media/sda2 it shows total 0.
When I perform dumpe2fs /dev/sda2 I get this message:
dumpe2fs 1.40-WIP (14-Nov-2006)
dumpe2fs: Bad magic number in super-block while trying to open /dev/sda2
Couldn't find valid filesystem superblock.
Is there any chance of recovering data from the drive or am I out of luck?
fdisk -l yields these results:
root@Knoppix:/ramdisk/home/knoppix# fdisk -l /dev/sda1
Disk /dev/sda1: 106 MB, 106896384 bytes
255 heads, 63 sectors/track, 12 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk /dev/sda1 doesn't contain a valid partition table
root@Knoppix:/ramdisk/home/knoppix# fdisk -l /dev/sda2
Disk /dev/sda2: 79.9 GB, 79925045760 bytes
255 heads, 63 sectors/track, 9717 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk /dev/sda2 doesn't contain a valid partition table
pvdisplay, vgadisplay, and lvdisplay yields these results:
root@Knoppix:/ramdisk/home/knoppix# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name VolGroup00
PV Size 74.41 GB / not usable 0
Allocatable yes
PE Size (KByte) 32768
Total PE 2381
Free PE 1
Allocated PE 2380
PV UUID 34v31h-rQS5-Lzjd-WuQC-F1EA-DnE2-Sj1ugr
root@Knoppix:/ramdisk/home/knoppix# vgdisplay
--- Volume group ---
VG Name VolGroup00
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 3
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 0
Max PV 0
Cur PV 1
Act PV 1
VG Size 74.41 GB
PE Size 32.00 MB
Total PE 2381
Alloc PE / Size 2380 / 74.38 GB
Free PE / Size 1 / 32.00 MB
VG UUID dhzswy-nDmJ-l32M-bTwJ-5tue-Qn1k-Ie9aad
root@Knoppix:/ramdisk/home/knoppix# lvdisplay
--- Logical volume ---
LV Name /dev/VolGroup00/LogVol00
VG Name VolGroup00
LV UUID fhLm4I-YxGM-uPrp-p54E-L0BZ-6RB1-4p9njg
LV Write Access read/write
LV Status NOT available
LV Size 72.44 GB
Current LE 2318
Segments 1
Allocation inherit
Read ahead sectors 0
--- Logical volume ---
LV Name /dev/VolGroup00/LogVol01
VG Name VolGroup00
LV UUID eFHGdu-0lUm-x2qa-vlJD-hayB-20ZT-wbJfYl
LV Write Access read/write
LV Status NOT available
LV Size 1.94 GB
Current LE 62
Segments 1
Allocation inherit
Read ahead sectors 0
Any suggestion or help would be appreciated. Thanks in advance.
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LEARN ABOUT FREEBSD
disktab
DISKTAB(5) BSD File Formats Manual DISKTAB(5)
NAME
disktab -- disk description file
SYNOPSIS
#include <disklabel.h>
DESCRIPTION
Disktab is a simple database which describes disk geometries and disk partition characteristics. It is used to initialize the disk label on
the disk. The format is patterned after the termcap(5) terminal data base. Entries in disktab consist of a number of `:'-separated fields.
The first field for each entry gives the names by which a disk's entry may be selected, separated by `|' characters. The last name given
should be a long name fully identifying the disk.
The optional fields for each entry are:
ID Type Description
ty str Type of disk (e.g. removable, winchester)
dt str Type of controller (e.g. SMD, ESDI, floppy)
ns num Number of sectors per track
nt num Number of tracks per cylinder
nc num Total number of cylinders on the disk
sc num Number of sectors per cylinder, ns*nt default
su num Number of sectors per unit, sc*nc default
se num Sector size in bytes, DEV_BSIZE default
sf bool Controller supports bad144-style bad sector forwarding
rm num Rotation speed, rpm, 3600 default
sk num Sector skew per track, default 0
cs num Sector skew per cylinder, default 0
hs num Headswitch time, usec, default 0
ts num One-cylinder seek time, usec, default 0
il num Sector interleave (n:1), 1 default
d[0-4] num Drive-type-dependent parameters
bs num Boot block size, default BBSIZE
sb num Superblock size, default 0
ba num Block size for partition `a' (bytes)
bd num Block size for partition `d' (bytes)
be num Block size for partition `e' (bytes)
bf num Block size for partition `f' (bytes)
bg num Block size for partition `g' (bytes)
bh num Block size for partition `h' (bytes)
fa num Fragment size for partition `a' (bytes)
fd num Fragment size for partition `d' (bytes)
fe num Fragment size for partition `e' (bytes)
ff num Fragment size for partition `f' (bytes)
fg num Fragment size for partition `g' (bytes)
fh num Fragment size for partition `h' (bytes)
oa num Offset of partition `a' in sectors
ob num Offset of partition `b' in sectors
oc num Offset of partition `c' in sectors
od num Offset of partition `d' in sectors
oe num Offset of partition `e' in sectors
of num Offset of partition `f' in sectors
og num Offset of partition `g' in sectors
oh num Offset of partition `h' in sectors
pa num Size of partition `a' in sectors
pb num Size of partition `b' in sectors
pc num Size of partition `c' in sectors
pd num Size of partition `d' in sectors
pe num Size of partition `e' in sectors
pf num Size of partition `f' in sectors
pg num Size of partition `g' in sectors
ph num Size of partition `h' in sectors
ta str Partition type of partition `a' (4.2BSD file system, swap, etc)
tb str Partition type of partition `b'
tc str Partition type of partition `c'
td str Partition type of partition `d'
te str Partition type of partition `e'
tf str Partition type of partition `f'
tg str Partition type of partition `g'
th str Partition type of partition `h'
FILES
/etc/disktab
SEE ALSO
getdiskbyname(3), bsdlabel(8), newfs(8)
HISTORY
The disktab description file appeared in 4.2BSD.
BSD
October 14, 2006 BSD