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> 
>    >> /DOS is mounted at init time as type MSDOS. May I "umount" it and
>    >> re-mount as VFAT without risks ?
> 
>    Self-answer : umount fails, tells /DOS is in use. I guess this one is
>    for
>    Steven...


I'm not Steven, but ...

You cannot unmount /DOS, beacuse that is where the root filesystem is.

You should be able to remount it, using a command along the lines of

mount -o remount -t vfat /dev/hda1 /DOS 

(Can't be absolutely certain as all I have here is the qemu version)


> 
>    >> Finally, are all mounts automatically undone at halt/reboot,
> 
>    That also...
> 


Yes - look in /etc/inittab

You will see some commands run at shutdown:

::shutdown:/sbin/swapoff -a
::shutdown:/sbin/umount -a -r 2>/dev/null

The umount command unmounts anything mounted (and sends the output to 
/dev/null
so you don't see it on the console.

Cheers

Yane