That sounds a little bit bad for me, based in some things i've read before, your disk is not ... very fine, may be is near to the end...
But, we hope it is not true...
so, may be if you write your configuration, disk, motherboard, etc, it could help.
You can try disabling the dma acces to your disk, is not a magic thing, but could help to recognize where is the problem.
The disk you talk about, is old?, was working fine before this problem?
Well, don't worry some one will give you the righ answer, but post more information...