Two different iOS X in two internal hard disks?

hi there!
i have my original internal hard drive, and a new SSD. can i have my old mac OS X 10.5 system in one hard disk, and 10.6 in the SSD, and swich them with no problem? ...or my machine will become crazy?
i need to work using 10.5 for some complicated tasks, but i want also to upgrade to 10.6.
thanks in advance!
david
Macbook black 4,1 6 RAM 2,4 GHz

great.
thank you very much!
david

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Two different iOS X in two internal hard disks?

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