Troubleshooting a failing hard drive
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Wikibooks: Minimizing Hard Disk Drive Failure and Data Loss
Self-Monitoring, Analysis, and Reporting Technology, or S.M.A.R.T.:
Filesystems and Mounting
Software to install and initial set up to do as soon as possible after installing your favourite Linux distribution.
Software to install
If fstab's 6th column is 0, the mount count is not checked.
Palimpsest Disk Utility (gnome-disk-utility)
On Ubuntu, the package name is:
Things to do regularly
... to prevent disaster.
When things get bad...
Symptoms of a failing drive
Here are a few examples of input/output errors encountered by various programs when the disk starts to fail:
* Directory listing output is full of question marks:
ls: cannot access *** Input/output error
d????????? ? ? ? ? ? mydirectory
* Cannot remove files:
$ sudo rm -f image.JPG
rm: cannot remove `image.JPG': Input/output error
* Cannot write to file, nor perform any operation which requires write access to the failing drive.
* Get "Bus error" to every command:
First steps to take
Whatever the problem is, it is important to make sure to save as much data as possible.
First of all, use
dd to make an image of the drive.
See the following post for a detailed explanation of
In our case, something like the following command would do:
# dd if=/dev/sda of=/mnt/backup/failing_drive_image.iso bs=2048 conv=sync,notrunc
Checks to run
Make sure the partition to check is unmounted.
fdisk -l to find the device path (e.g. /dev/sda1).
Check man e2fsck for more information on options.
Either boot from a "rescue" CD (or an installer and choose Rescue mode), or add the kernel boot option "forcefsck" along with the "ro" option (on both Debian and Red Hat systems).
Issues related to this page:
|Project||Summary||Status||Priority||Category||Last updated||Assigned to|
|Linux software||ls: cannot access *** Input/output error||active||normal||bug report||8 years 11 weeks|
|Linux software||Best use of e2fsck||active||critical||task||10 years 47 weeks|
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