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In Ubuntu (and most Linux distributions), your disks are checked every certain number of times your computer starts (using "fsck", "file system consistency check") to detect errors and correct them. If you're in a hurry, you can press the ESC key to skip this checking process and it will scan the disks the next time you start your computer.

But if you want, you can change the frequency of this disk checks using "tune2fs", which adjusts ext2/ext3 filesystem parameters. Here is an example:
sudo tune2fs -c 50 /dev/hda2
This command will change the check frequency for the partition /dev/hda2, so now this disk will be checked every 50 restarts.

Also, you can specify the number of days between days instead of the number of times your computer starts:
sudo tune2fs -i 10d /dev/hda2
The above command sets /dev/hda2 to be checked every 10 days. You can also set this check time in weeks, months, etc (though this is not recommended): simply use "w" - for weeks, instead of "d" - for days, in the above command and so on.

For more information I recommend reading the manual page with:
man tune2fs

[via blogubuntu.com]
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