Hmm. Could you do a ls -lart /var/log just after the mount has gone away. That will show you if there have been any log files that have been modified recently. Then please do a tail -20 /var/log/messages (and similarly for any other files that have been modified recently).
Since I posted this message its not happening. Its very random. I will try this when it happens.
At a guess, I'd say that there's either something wrong with the drive, something wrong with the cable, or possibly with the motherboard.
I am guessing that it has something to do with drive or cable. My vfat drive is and old 20GB seagate drive which I just used it as storage of all sort of temp things, while FC is installed in 7200rpm 40GB drive. I don't know if mixture of different speed could cause this. By the way this is dual boot system and widows xp show no such signs and symptoms which FC has been showing (this is where I got confused more).
Out of interest, what are /dev/hda and /dev/hdc? Is there anything else on those two IDE channels?
yes I have three drives (1st drive is WIN/FC5 dual boot. one is ntfs and other is vfat drive) and 1 DVD drive.
