well, i got into my usb system by using the "rd=diskXsY" boot flag.

but now i think i kind of invalidated my "com.apple.Boot.plist"...
i tried to insert the flag via terminal but copied afterwards between the two installs.
for achieving this i had to set permissions for the folder (in finder).
now the .plist no longer shows the plist icon and i assume it is not loaded as the rd= flag
does not work automatically.

any ideas how to fix the .plist (why the need to use sudo nano in the first place anyway?)

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edit:

adding flag to .plist worked (using nano), i got 2 seperate installs now.
setting startup volume in sys config does not work...

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Leopard 10.6.5 | Core i3 | Gigabyte H55M-USB3 | ATI 5770 | Coolermaster Cosmos