disk error / reboot / 6.3

[jerome]

Hi,  
   
We are running 6.3 on a fileserver with a couple of data disks.  
   
Once the server encounters an error on a data disk (os disk is separate) the server will reset itself without warning.  
   
We can usually identify the problem disk with a smartctl, the disk will show 'Offline uncorrectable errors'.  
   
The fact that the server reboots itself, is this normal? Can we prevent this from happening?  
The disks are attached to the on-board sata ports of the mainboard itself, so no (raid)controllers whatsoever.  
We also do not use software raid.  
   
Best regards  
   
Jerome