I had something similar on an MSI notebook (dualbooting with XP).
During Slackware startup, similar errormessages popped up. The system ran normally, however. In XP no messages were displayed and also no warnings.
Then, on a bad day, the machine refused to start. No XP and no Slackware. The disk was tested with the Hitachi Drive fitness test: http://www.hitachigst.com/support/downloads/
and found to be OK. Still, no actions were possible.
The laptop was still under warranty so I returned it to be fixed. It took the dealer 6 weeks to find out that the drive was OK, but the controller on the main board was gone. I was allowed o get a new laptop from their assortment. Now we have a Toshiba. Working fine.
So, if Linux reports a system error with your drives, do not wave it away. ACT NOW. Linux warnings come in an early stage. I would take no risks. Get the data off while you still can and install a new disk.
Leave this disk in as extra storage; you never know....