Hello,

While trying to restart my machine I receive the following error:

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Warning...fsck.reiserfs for device /dev/root exited with signal 6.

fsck.reiserfs /dev/root failed (status 0x8). Run manually fsck failed. Mounting root device read only.
Mounting root /dev/root
ReiserFS:hda3:found reiserfs format "3.6" with standard journal.

hda: task_in_intr:status=0x51 { DriveReady SeekComplete Error }
hda: task_int_intr:error=0x10 { SectorId NotFound }
LBAsect=117150249, sector=117150249

ide:failed opcode was: unknown

.not found = exiting to /bin/sh
sh: can't access tty: job control turned off

Buffer I/O error on device hda3, logical block 29157767
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After receiving this error the OS doesn't startup.

What does it mean and how can I get rid of this error?

sounds like you have some problems there. if your drive has SMART then have it check at system boot to see if you have disk errors. run some disk utils on it to scan the disk for any sector issues. you most likely need to rebuild the superblock in this case, if your drive has physical problems its time to get a new one.

Why is it listing /dev/root. What does your /etc/fstab say?
What does your bootloader's config look like?