how to switch off ...
 

if the unmount is unclean, the disk is forced into checking hard disk

how do we turn it off....

Regards
Xing

I think it only happens with ext2. Try ext3.

if i change my filesystem , does it not mean that i wil have to format my disk so i will be losing precious data... is there any other way out... ????

You won't have to format if you upgrade from ext2 to ext3. I think you can change the entries in /etc/fstab to read ext3 instead of ext2 and reboot. It should be using ext3 without any more hassle.
Still, be careful when playing with fstab entries...

glj

before you do that, do this:
tune2fs -j /dev/hdxx
This will add journalling support to the filesystem, thus making it ext3. Then the updated fstab entries will definitely work.