"I want to change the order of these two drives, so Mandrake is now on hda. Is this possible without reloading ?"
Yes. Switch the drive cable. You also have to change your bootloader configuration, install the bootloader on the MBA of the new /dev/hda, and change /etc/fstab in both Linux systems.
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Be prepared. Create a LifeBoat CD.
http://users.rcn.com/srstites/LifeBo...home.page.html
Steve Stites