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Mac Forum / General / General / July 2006



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Bootable Firewire External enclosure - this one works on Mac-Mini.

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iona@io.net - 01 May 2006 19:42 GMT
Adaptec ACS-200 hard drive enclosure Combo
usb/firewire works fine on my old Mac-mini
using the supplied firewire cable and an 80gb
Seagate 3.5in drive I had on hand.

First initialized the seagate using Disk Utility
and then did a whole drive random write (8x)
which took about 48 hours to complete. Then
created 2 partitions: a 14gb and a ~62gb.
My internal 80gb hd has just under 10gb OS+data so
the 14gb partition will offer sufficient
space for backups for the forseeable future.

Downloaded the latest version of SuperDuper from
www.versiontracker.com and made the
backup to the 14gb partition on the external
harddrive. Flawless and easy software program
for this backup chore.

Rebooted Mac-mini and went into
Apple>preferences>startup or something to that
effect
and chose the new startup disc. Then rebooted
again and could see the ext drive LED
flashing as the system was brought up. For proof I
went into Disk Utility and 'got info' on
each of the partitions and, yes, now the 14gb was
"/" meaning that it was the boot drive
for this session. Subsequent bootups have all been
with this ext drive without my having
to choose anything.

The internal drive apparently is now in sleep mode
as I don't hear it or use it either. The
system is a good bit snappier with the 3.5in
harddrive as you would expect. Not sure if
I've yet seen the dreaded spinning beachball. My
ram is still the abysmally small 256mb.

The 80gb Seagate has suffered partition loss in a
wintel box so I took the time here to be
sure it was undamaged. Disk Utility reported no
errors after the 8x random write test;
likewise the partitioning.

I was about to buy a usb ext enclosure when I
remembered that the Mac-mini would
only boot with a firewire external. With the
nearest Apple store being 50 miles away I
tried Best Buy and they had at least a couple
combo ext drives complete with harddrives,
but also had this Adaptec empty ext case for
$72-US which I grabbed. You can probably
get it cheaper by mail but I needed to backup the
year old Mac-mini immediately. He
who loses data on a second system in the same week
be a fool!!

Also, I had setup the Mac-mini NOT to ask for
password each time, so naturally this
fool lost it. And SuperDuper absolutely requires
it. The Apple literature does not say so
but you *can* bootup with the Install CD (while
holding down the C key), choose: create
new password and then exit immediately.

This particular Firewire external drive DOES WORK-
not all do!! Hope this helps others
who have put off backing up their Mac-minis for
too long.
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iona

Mamamia - 02 May 2006 11:52 GMT
> I was about to buy a usb ext enclosure when I
> remembered that the Mac-mini would
[quoted text clipped - 8 lines]
> who loses data on a second system in the same week
> be a fool!!
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.
Signature

"It is easier to fight for your principles
than to live by them."

And the answer IS ? - 30 Jul 2006 13:48 GMT
>> 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.

Signature

Mvh./Regards,    Niels Jørgen Kruse,    Vanløse, Denmark

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.

Signature

Tom Stiller

PGP fingerprint =  5108 DDB2 9761 EDE5 E7E3
                  7BDA 71ED 6496 99C0 C7CF

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.
 
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