How do you switch startup disks ?

How do you switch hard disks, one is full, the other is blank ?

If I understand your question correctly, there is really no need to switch startup disk.
You can just move the larger files, say music or photos from the system disk over to the disk drive that is blank now. OS X will then work with both disk drive at the same time. It will get the system and application data from the system disk drive and the music or photo data from the disk drive that is currently blank.
The only thing you will have to do is tell the application where you moved the data files to so that it can find them when it needs them.
Allan

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    WhatSize (SHAREWARE)
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    !http://i50.tinypic.com/izvwo1.gif!

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