No mac will boot from a USB drive.
I've been running my mini on an external 160G Western Digital firewire
drive (8 megs RAM) for quite some time, and it's considerably snappier
than the original mini drive, which comes with a rather slow laptop
drive in it.
I also just bought a new LaCie F A Porsche 250G external firewire for
$126 *shipped*, from Dell Computer store's site. (offer now expired,
unfortunately) I haven't tried booting the mini off the LaCie, but I
think it would be easily doable.

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>> I was about to buy a usb ext enclosure when I remembered that the
>> Mac-mini would
[quoted text clipped - 16 lines]
> haven't tried booting the mini off the LaCie, but I think it would be
> easily doable.
This might be a stretch but....
Does anyone know if you can boot from a disk image on a USB drive that
is hooked into the Mac through a firewire port? (ie, through a hub)
It's true the Mac won't allow you to boot from a drive it sees as a
USB. The question is whether or not that is due to an inquiry to the
drive's "resume" or whether it is recognized that the drive is hooked
up through the USB.
Assuming you can get through that, there's also the issue of true
speed. The firewire protocol is by all accounts better - even if the
"benchmark" speeds for USB2/firewire-a = 480/400. Going through the
hub will have its own overhead...
Malcolm - 30 Jul 2006 14:13 GMT
>>> I was about to buy a usb ext enclosure when I remembered that the
>>> Mac-mini would
[quoted text clipped - 31 lines]
> "benchmark" speeds for USB2/firewire-a = 480/400. Going through the
> hub will have its own overhead...
You can't hook a USB device to a FireWire port. A hub is either all
USB or all FireWire. There are some boxes that contain FireWire and
USB hubs, but the hubs are not connected (except, maybe, for power).
Tim - 30 Jul 2006 15:29 GMT
> >> I was about to buy a usb ext enclosure when I remembered that the
> >> Mac-mini would
[quoted text clipped - 31 lines]
> "benchmark" speeds for USB2/firewire-a = 480/400. Going through the
> hub will have its own overhead...
I missed the beginning of this thread ... I might be wrong but I thought
that I read previously that some of the newer macs can boot from usb. Is
that right or wrong?
Niels Jørgen Kruse - 30 Jul 2006 17:49 GMT
> I missed the beginning of this thread ... I might be wrong but I thought
> that I read previously that some of the newer macs can boot from usb. Is
> that right or wrong?
Intel Macs can boot from USB2. Some older PPC Macs can boot OS9 from
USB1.1. Misinformation is endless. Don't expect refutation every time,
unless you do it yourself.

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Tom Stiller - 30 Jul 2006 22:39 GMT
> > I missed the beginning of this thread ... I might be wrong but I thought
> > that I read previously that some of the newer macs can boot from usb. Is
[quoted text clipped - 3 lines]
> USB1.1. Misinformation is endless. Don't expect refutation every time,
> unless you do it yourself.
But _no_ Mac will boot from a disk image; It has to be a real, physical
volume.

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Neill Massello - 30 Jul 2006 21:40 GMT
> Does anyone know if you can boot from a disk image on a USB drive
You cannot boot from a disk _image_ on a local drive, no matter if the
drive is FireWire, USB, ATA, SATA, or SCSI. You can only boot from a
_volume_ on a local drive.
Not all Macs can boot from FireWire, and only some can boot from USB.
Not all FireWire or USB bridge chips are compatible with Mac booting.