Hi Amiboy,
This sounds like something that struck me a few years back. I had 1 partition dedicated to caching Ibrowse files (inages, cookies, etc) from the internet. That partition became corrupted (power outage, or lost connection or something) and it strangely affected all other partitions of that hard drive, including the one I booted from. I can't remember, but it seems that I had to reformat all partitions to get back to normal. I now only cache internet files to the Ram Disk:, seems to work just as well and who needs a permanent record of those files anyway. It probavly doesn't matter, but, what filesystem are you using?