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From: Volker Armin Hemmann <volkerarmin@googlemail.com>
To: gentoo-user@lists.gentoo.org,
Mark Knecht <markknecht@gmail.com>
Subject: Re: [gentoo-user] Re: USB drive dead? (Commands to check?)
Date: Sun, 20 Sep 2009 00:59:01 +0200
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On Sonntag 20 September 2009, Mark Knecht wrote:
> On Sat, Sep 19, 2009 at 3:21 PM, Mark Knecht <markknecht@gmail.com> wrote:
> > Hi,
> > I seem to have lost an external USB drive I've been using on my
> > MythTV backend server for video storage. What commands can I try to
> > get it to wake up or at least show me what's working and what isn't?
> > The drive shows under fdisk /dev/sda. I can see the large partition,
> > and it seems to be the right size, according to fdisk anyway, but I
> > cannot mount it using mount, and so far I cannot get e2fsck to do
> > anything. Both of these fail:
> >
> >
> > mount -t ext2 /dev/sda1 /video
> > mount -t ext3 /dev/sda1 /video
> >
> > I have power cycled the drive and I've rebooted the MacMini. Nothing
> > changed.
> >
> > Thanks in advance,
> > Mark
> >
> > MacMini ~ # fdisk /dev/sda
> >
> > The number of cylinders for this disk is set to 19929.
> > There is nothing wrong with that, but this is larger than 1024,
> > and could in certain setups cause problems with:
> > 1) software that runs at boot time (e.g., old versions of LILO)
> > 2) booting and partitioning software from other OSs
> > (e.g., DOS FDISK, OS/2 FDISK)
> >
> > Command (m for help): p
> >
> > Disk /dev/sda: 163.9 GB, 163928604672 bytes
> > 255 heads, 63 sectors/track, 19929 cylinders
> > Units =3D cylinders of 16065 * 512 =3D 8225280 bytes
> > Disk identifier: 0xa9b5c6b5
> >
> > Device Boot Start End Blocks Id System
> > /dev/sda1 1 19929 160079661 83 Linux
> >
> > Command (m for help):
> >
> >
> >
> > MacMini ~ # df
> > Filesystem 1K-blocks Used Available Use% Mounted on
> > /dev/hda4 75890040 37169416 34865560 52% /
> > udev 10240 156 10084 2% /dev
> > shm 257396 0 257396 0% /dev/shm
> > MacMini ~ # fsck -t ext3 /dev/sda
> > fsck 1.41.3 (12-Oct-2008)
> > e2fsck 1.41.3 (12-Oct-2008)
> > fsck.ext3: Superblock invalid, trying backup blocks...
> > fsck.ext3: Bad magic number in super-block while trying to open /dev/sda
> >
> > The superblock could not be read or does not describe a correct ext2
> > filesystem. If the device is valid and it really contains an ext2
> > filesystem (and not swap or ufs or something else), then the superblock
> > is corrupt, and you might try running e2fsck with an alternate
> > superblock: e2fsck -b 8193 <device>
> >
> > MacMini ~ # e2fsck -b 8193 /dev/sda
> > e2fsck 1.41.3 (12-Oct-2008)
> > e2fsck: Bad magic number in super-block while trying to open /dev/sda
> >
> > The superblock could not be read or does not describe a correct ext2
> > filesystem. If the device is valid and it really contains an ext2
> > filesystem (and not swap or ufs or something else), then the superblock
> > is corrupt, and you might try running e2fsck with an alternate
> > superblock: e2fsck -b 8193 <device>
> >
> > MacMini ~ # fsck -t ext3 /dev/sda1
> > fsck 1.41.3 (12-Oct-2008)
> > e2fsck 1.41.3 (12-Oct-2008)
> > fsck.ext3: Attempt to read block from filesystem resulted in short
> > read while tr ying to open /dev/sda1
> > Could this be a zero-length partition?
> > MacMini ~ # e2fsck -b 8193 /dev/sda1
> > e2fsck 1.41.3 (12-Oct-2008)
> > e2fsck: Bad magic number in super-block while trying to open /dev/sda1
> >
> > The superblock could not be read or does not describe a correct ext2
> > filesystem. If the device is valid and it really contains an ext2
> > filesystem (and not swap or ufs or something else), then the superblock
> > is corrupt, and you might try running e2fsck with an alternate
> > superblock: e2fsck -b 8193 <device>
> >
> > MacMini ~ # e2fsck -b 8193 /dev/sda
> > e2fsck 1.41.3 (12-Oct-2008)
> > e2fsck: Bad magic number in super-block while trying to open /dev/sda
> >
> > The superblock could not be read or does not describe a correct ext2
> > filesystem. If the device is valid and it really contains an ext2
> > filesystem (and not swap or ufs or something else), then the superblock
> > is corrupt, and you might try running e2fsck with an alternate
> > superblock: e2fsck -b 8193 <device>
> >
> > MacMini ~ #
>=20
> A little more info:
>=20
> Buffer I/O error on device sda, logical block 12
> sd 0:0:0:0: [sda] Result: hostbyte=3D0x00 driverbyte=3D0x08
> sd 0:0:0:0: [sda] Sense Key : 0x3 [current]
> sd 0:0:0:0: [sda] ASC=3D0x4b ASCQ=3D0x0
> end_request: I/O error, dev sda, sector 96
> Buffer I/O error on device sda, logical block 12
> sd 0:0:0:0: [sda] Result: hostbyte=3D0x00 driverbyte=3D0x08
> sd 0:0:0:0: [sda] Sense Key : 0x3 [current]
> sd 0:0:0:0: [sda] ASC=3D0x4b ASCQ=3D0x0
> end_request: I/O error, dev sda, sector 96
> Buffer I/O error on device sda, logical block 12
> sd 0:0:0:0: [sda] Result: hostbyte=3D0x00 driverbyte=3D0x08
> sd 0:0:0:0: [sda] Sense Key : 0x3 [current]
> sd 0:0:0:0: [sda] ASC=3D0x4b ASCQ=3D0x0
> end_request: I/O error, dev sda, sector 96
>=20
> MacMini ~ # fsck -t ext3 /dev/sda1
> fsck 1.41.3 (12-Oct-2008)
> e2fsck 1.41.3 (12-Oct-2008)
> fsck.ext3: Attempt to read block from filesystem resulted in short
> read while trying to open /dev/sda1
> Could this be a zero-length partition?
> MacMini ~ #
>=20
>=20
> end_request: I/O error, dev sda, sector 95
> __ratelimit: 58 callbacks suppressed
> Buffer I/O error on device sda1, logical block 16
> Buffer I/O error on device sda1, logical block 17
> Buffer I/O error on device sda1, logical block 18
> Buffer I/O error on device sda1, logical block 19
> Buffer I/O error on device sda1, logical block 20
> Buffer I/O error on device sda1, logical block 21
> Buffer I/O error on device sda1, logical block 22
> Buffer I/O error on device sda1, logical block 23
> Buffer I/O error on device sda1, logical block 24
> Buffer I/O error on device sda1, logical block 25
> sd 0:0:0:0: [sda] Result: hostbyte=3D0x00 driverbyte=3D0x08
> sd 0:0:0:0: [sda] Sense Key : 0x3 [current]
> sd 0:0:0:0: [sda] ASC=3D0x4b ASCQ=3D0x0
> end_request: I/O error, dev sda, sector 95
> __ratelimit: 86 callbacks suppressed
> Buffer I/O error on device sda1, logical block 16
> Buffer I/O error on device sda1, logical block 17
> Buffer I/O error on device sda1, logical block 18
> Buffer I/O error on device sda1, logical block 19
> Buffer I/O error on device sda1, logical block 20
> Buffer I/O error on device sda1, logical block 21
> Buffer I/O error on device sda1, logical block 22
> Buffer I/O error on device sda1, logical block 23
> Buffer I/O error on device sda1, logical block 24
> Buffer I/O error on device sda1, logical block 25
> MacMini ~ #
>=20
>=20
> I could try reinstalling the file system but I had a few backups on
> this drive for other systems. (non-critical, but possibly useful) I'd
> like to be sure I cannot recover them before I blow everything away.
>=20
> Thanks,
> Mark
>=20
you might be lucky and able to use smartctl on that device. Sadly most usb=
=20
converters don't support smart even when the drive does.
That could tell you some more, but a quick glance says:
your drive is hosed.=20
Block errors... ugh... maybe the heads had a bit of platter contact.
You can try using magicrescue - or even better photorec.
they won't repair your filesystems - but they might be able to get the data=
off=20
you are after.
Gl=C3=BCck Auf
Volker