LiveCD wiping root partition?

[Douglas McClendon]

Rahul Sundaram wrote:
> Michel Salim wrote:
> 
>>
>> Anyway, hard lesson learned. I wonder how Ubuntu does their live CD 
>> install. openSUSE is introducing one too, hopefully for their users 
>> the same bug does not occur.
> 
> Pretty much every live cd does a dd afaik.

ubuntu 7.04 keeps their rootfs natively on squashfs (versus fedora which keeps 
it natively on an ext3 image which lives on a squashfs).

Therefore they can't be doing a dd for the install.

The reason for the difference is because ubuntu uses unionfs for copy-on-write, 
whereas fedora uses devicemapper-snapshot for copy-on-write.

-dmc