FC 11 Boot mode single user [recovery password]

[suvayu ali]

2009/8/10 Jerry Feldman <gaf at blu.org>:
> On 08/10/2009 09:01 AM, Tiago Araujo wrote:
>> Dear,
>>
>> I need recovery password in FC 11.
>>
>>
> There is none. The best way to recover a lost root password is to boot
> the installation media, the root file system should be mounted on
> /mnt/sysimage, but if it is not, you can mount it by hand.
>
> The use the chroot(8) command  to set /mnt/sysimage as your root, then
> use the passwd(1) command to change the password, then to be safe,
> unmount /mnt/sysimage.
>
> Example:
> (if the root file system is not mounted: mount /dev/sda2 /mnt/sysimage
> (assuming this is where root is) )
> chroot /mnt/sysimage
> passwd
> -->you will be prompted
> umount /mnt/sysimage
>
> The reboot. The umount is very important.

Just for knowledge's sake, why is the umount so important?

-- 
Suvayu

Open source is the future. It sets us free.