can start an uml  users can write read, but when it reboot , the uml backt to the orginal system? 

2006/7/1, paul john <>:

2006/6/30, Jeff Dike <>:
On Thu, Jun 29, 2006 at 11:56:05PM +0800, paul john wrote:
> i tried to make a system ,that users can't modify it. is that often be used
> ubd0*r *,this r is always won't be use ?

What do you think would happen if you tried booting a machine with its
root filesystem on a CD-ROM?
i understood.
but where the option ubd0r  used for ?


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