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Recently I have lot of DISK I/O Errors. I am not able to save anything even on my home partition. I have the same problems in 12.04, 12.10 and now in 13.04.
Following is the output of mtab

/dev/sda8 / ext4 rw,errors=remount-ro 0 0
proc /proc proc rw,noexec,nosuid,nodev 0 0
sysfs /sys sysfs rw,noexec,nosuid,nodev 0 0
none /sys/fs/cgroup tmpfs rw 0 0
none /sys/fs/fuse/connections fusectl rw 0 0
none /sys/kernel/debug debugfs rw 0 0
none /sys/kernel/security securityfs rw 0 0
udev /dev devtmpfs rw,mode=0755 0 0
devpts /dev/pts devpts rw,noexec,nosuid,gid=5,mode=0620 0 0
tmpfs /run tmpfs rw,noexec,nosuid,size=10%,mode=0755 0 0
none /run/lock tmpfs rw,noexec,nosuid,nodev,size=5242880 0 0
none /run/shm tmpfs rw,nosuid,nodev 0 0
none /run/user tmpfs rw,noexec,nosuid,nodev,size=104857600,mode=0755 0 0
/dev/sda2 /mnt/C fuseblk rw,nosuid,nodev,allow_other,blksize=4096 0 0
/dev/sda3 /mnt/D fuseblk rw,nosuid,nodev,allow_other,blksize=4096 0 0
/dev/sda7 /home ext4 rw 0 0
binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,noexec,nosuid,nodev 0 0
gvfsd-fuse /run/user/v/gvfs fuse.gvfsd-fuse rw,nosuid,nodev,user=v 0 0
v@t400:~$   

When I reboot, I get a disk check error message at "Splash Screen". I select "F" to fix the error, and then I am able to resolve the issues.
Skype is the first application to report the error for DISK I/O error.
If I try to take a snapshot of the error shutter does not allow me to save the picture even in my home partition.

Also strangely enough

/dev/sda5       300933120   304836607     1951744   82  Linux swap / Solaris    
/dev/sda6       304838656   309637119     2399232   82  Linux swap / Solaris    

I have two swap partitions. Can this happen on its own ? I am sure I never made more than one.

Can any suggest, what must be going wrong here ?

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2 Answers

Boot a live usb/cd, anything with gparted on it, use it to check the partition, the partition must be unmounted
Taken on 04/28/2013, at 10:54:11 AM
if it fails your drive may be shot, there are some things you can try if it is a ssd (firmware upgrade/use AHCI mode/ trim)

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Take a backup of /etc/fstab file

And then change

/dev/sda8 / ext4 rw,errors=remount-ro 0 0

to

/dev/sda8 / ext4 rw,errors=continue 0 0

and then

sudo reboot

share|improve this answer
    
/dev/sda8 is my root. Will it be safe. –  Vivek Sharma May 2 '13 at 3:05
    
Also strangely enough /dev/sda5 300933120 304836607 1951744 82 Linux swap / Solaris /dev/sda6 304838656 309637119 2399232 82 Linux swap / Solaris I have two swap partitions. Can this happen on its own. I am sure I never made more than one. –  Vivek Sharma May 2 '13 at 3:07
    
I have made the changes, but I am still getting that error frequently. –  Vivek Sharma May 14 '13 at 12:21
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