Booting from USB

Matthias Oestreicher matthias at
Sun Jun 9 09:18:07 UTC 2019

I assume your portable SSD is connected to USB and you most probably use a USB pen
drive to install as well.

What often happens is, that your installation pen drive is /dev/da0 while your portable
SSD is /dev/da1 during install. So the installer will add an entry to /etc/fstab that
/dev/da1 is where the system should boot from in the future.
Now you reboot and remove your pendrive. With the pendrive gone, your SSD will now be
/dev/da0, but it tries to boot your newly installed system from /dev/da1..., since
that's what in /etc/fstab.

You could either drop to the shell after install is finished and fix the entry in
/etc/fstab before you reboot and exit the installer, or...
Reboot the machine, and when loading fails, at the loader prompt tell the loader
something like

> UFS:/dev/da0p2
(may be da0p3, depends on what the installer did. in FreeBSD one can type "?" to list
devices. I've never used Trident)

Then when the system is up, fix /etc/fstab entry from e.g. /dev/da1p2 to /dev/da0p2

Am Sonntag, den 09.06.2019, 17:04 +1000 schrieb Anders Jensen-Waud:
> On 9/6/19 2:48 pm, Brian Wood wrote:
> > I installed Trident onto a portable SSD.  When I boot from
> > that SSD, it works fine on an older machine, but doesn't
> > work on my Dell Latitude.  I've tried changing some Bios
> > settings, but that hasn't helped.
> > 
> > I was thinking about dual booting the Dell a week or so ago,
> > but decided to try having the OSes on separate drives.
> > Thanks for ideas on how to figure it out.
> Does the new machine use EFI? How far in the boot process does it go?
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