That can work, depending on what external HDD you bought. You see, i
have a western digital "digital book" 500GB HDD extrnal that plugs in
through firewire, but it will not be seen from my Mac at startup,
because I haven't read on the box that it sad "Requires Mac OS X
10.3.9 or later odr for windows, Windows XP SP2 or later. My system
boots from a flahs drive quickly, silently, and efficiently.

On 4/9/10, Kris Tilford <[email protected]> wrote:
> On Apr 9, 2010, at 10:59 PM, Jonas Lopez wrote:
>
>> BUT as you pointed out, a USB XHD will not start up.
>> NOW, is there any USB XHD that does NOT have their own power supply
>> and so can start up?
>
> These external USB HDs WILL boot. You must attach the HD prior to
> booting and have it fully powered up prior to starting the Mac. Hold
> the Option key at startup to select the USB drive. You can also select
> the USB drive from Apple Startup Disk if you're booted in OS 9, but
> this WILL NOT work with Startup Disk in OS X. Using the Option key is
> the best idea.
>
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