On Apr 3, 2009, at 11:08 AM, pat wrote:

>
> On Apr 2, 10:03 pm, Brian Troisi <[email protected]> wrote:
>> To boot from it, put it in, and hold option while
>> booting. If the OS you want to boot shows up, click it. GOod luck!
>
> Will it show the OS is from the HDD or from the USB?
> If the OSes are all the same, will I get confuse?
> Hold down the option can also boot from firewire hard drive?

Yeah. If you have OS X 10.5 on the USB drive, and 10.5 on the HDD, it  
will show different drives to boot off of. Or, you can use System  
preferences, and click the Startup Disk preference pane to chose your  
Firewire or USB drive, or even a partition on the boot disk to boot  
off of. Good luck! Btw, this can boot windows, linux, os x, etc.  
Startup Disk can also choose CD's or DVD's to boot from. 

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