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Date: Tue, 17 Mar 2009 18:51:45 -0400
From: Steve Bertrand <steve@ibctech.ca>
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To: Andrew Moran <amoran@forsythia.net>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Booting freebsd 7.1 from Firewire or USB2 drive
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Andrew Moran wrote:
> 
> Hey guys,
> 
> I was wondering if anyone had any success in installing FreeBSD 7.1 on a
> USB2 or Firewire 800 drive connected to an intel Mac Mini and
> successfully booting off of it?

I don't know about the Mac Mini part, but I certainly boot FreeBSD 7.1
from USB2 drive:

pe-acc-2b# df -h
Filesystem    Size    Used   Avail Capacity  Mounted on
/dev/da0a     939M    425M    439M    49%    /
devfs         1.0K    1.0K      0B   100%    /dev
/dev/md0       31M     16K     28M     0%    /tmp
/dev/md1       15M     36K     14M     0%    /var/run
/dev/md2       31M    2.4M     26M     9%    /var/log
/tmp           31M     16K     28M     0%    /var/tmp

da0: <Flash Drive SK_USB20 1.00> Removable Direct Access SCSI-2 device
da0: 974MB (1994752 512 byte sectors: 64H 32S/T 974C)
Trying to mount root from ufs:/dev/da0a

Steve