| Okay. Let's put it this way, then:
System A is installed on your internal drive (volume A). Booting from system A uses volume A for virtual memory.
System B is installed on an external (or secondary internal) drive (volume B). Booting from system B uses volume B for virtual memory. Per default, your system will *always* use the volume you _boot_ from for virtual memory. The (active) system volume.
After you have successfully booted into _any_ system volume, you can use the System Preferences' "Startup Volume" preference panel to set the startup volume for future reboots.
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MacBook Air 13" 1.6 GHz, 2 GB RAM, 80 GB HD. Mac OS X 10.5.5
Hackintosh Core2Duo 2.4 GHz, 2 GB RAM, 160 GB HD. Mac OS X 10.5.5
iPhone 3G 16 GB white, AppleTV 1G 40 GB
Mac user since 1987, Apple Product Professional 2007, 2008. Apple Certified Support Professional 10.5 |