Re: [gentoo-user] Grub hangs when a USB disk is attached

[andrea <momesso.andrea@gmail.com>]

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On gio, 2008-02-28 at 12:54 -0500, Don Jerman wrote:
> I've had problems with disk presentation order changing (fairly
> randomly) when USB disks are attached during boot.  Apparently there's
> a race between the SCSI controller and the USB controller(s).  If you
> attach the USB disk later the SCSI stuff has all been discovered so of
> course it gets allocated later in the list, but if it's attached while
> booting the USB disk might come first or in the middle somewhere.
> 
> This might lead to grub looking for its files in the wrong place,
> which might explain the hang.

This is exactly what happens here.

> 
> If you want to test this theory, boot from a CD while the USB is
> installed and see where it winds up in /dev, then boot without it.  Be
> very careful about assuming drive  identities!  That's how I lost my
> system disk last time -- /dev/sdb seemed to be partitioned funny and I
> figured it out just a little too late.
> 

I booted in a livecd and opened a grub command line. It reads my usb
disk as (hd0,0).

By the way I don't like this behavior and I need a solution to fix it.
It is a laptop and I don't want to umount and unplug my usb disk every
time I need to hibernate my system.



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