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 = cylinders of 16065 * 512 = 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 ~ #
