For a period of time, Compaq systems were configured so they'd only
boot off a hidden partition on the drive. I fought with one for weeks
(years ago) before I had the bright idea to take the drive out and
zero it manually.  After that, it would boot off CD and USB like any
other system.

-Josh More

On Fri, Feb 22, 2013 at 8:24 AM, Jeremy MountainJohnson
<jeremy.mountainjohnson at gmail.com> wrote:
> Greetings,
>
> My apologies if I posted this twice, I accidentally used another
> e-mail for the first attempt.
>
> I have a handful of Compaq 6200 Mini tower slim chassis (i5, 3.1 ghz)
> that I'm trying to boot from a Linux thumb drive but none will boot.
> Has anyone used these before with USB booting?
>
> The thumb drive is USB3, however it works fine on all other systems,
> including USB2 only older Core2 systems. In fact, I can even boot Macs
> just fine using Plop boot CD (permits booting of USB from CD). So,
> it's definitely not the thumb drive or OS (also have proper hook for
> block devices is compiled in the kernel image).
>
> I tried using a powered USB hub as well, and Plop boot CD in these
> machines but it won't see the drive either way. The BIOS is set up to
> allow booting from USB. When I boot to the start up menu, it doesn't
> see the USB drive at all (have tried front and back ports). It's like
> it doesn't exist until Windows boots. The drive has a light and it
> lights up during POST, so it's getting some power. When I boot into
> Windows it sees the drive just fine.
>
> BIOS firmware is up to date, it uses American Megatrends firmware with
> HP branding on it.
>
> Any thoughts? Seems silly that these not so old workstations won't
> boot to USB...
>
> --
> Jeremy MountainJohnson
> Jeremy.MountainJohnson at gmail.com
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