With my motherboard, I just leave the USB drive plugged, and change a bios setting to boot from the usb port. (Intel Motherboard D945gnt). Leslie Satenstein <blockquote class="replbq" style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"><Ed.Greshko@greshko.com><fedora-list@redhat.com><fedora@leemhuis.info><fedora-list@redhat.com><todbot88@gmail.com><fedora-list@redhat.com><rab@nauticom.net><gilboad@gmail.com><fedora-list@redhat.com><valent.turkovic@gmail.com><fedora-list@redhat.com><fedora@leemhuis.info><todbot88@gmail.com><fedora-list@redhat.com><dj@delorie.com><k5di@zianet.com><fedora-list@redhat.com><k5di@zianet.com><fedora-list@redhat.com><tim@birdsnest.maths.tcd.ie><fldbs3$okn$1@ger.gmane.org><tim@birdsnest.maths.tcd.ie><fldcb1$pi2$1@ger.gmane.org><tim@birdsnest.maths.tcd.ie><fldd7n$rem$1@ger.gmane.org><valent.turkovic@gmail.com><fedora-list@redhat.com><tim@birdsnest.maths.tcd.ie><flddj3$sbo$1@ger.gmane.org>Message: 14 Date: Tue, 01 Jan 2008 13:12:54 +0000 From: John Austin <ja@jaa.org.uk> Subject: Re: F8 installation in external usb disk (not USB key) To: For users of Fedora <fedora-list@redhat.com> Message-ID: <1199193174.5598.76.camel@fuerte> Content-Type: text/plain On Mon, 2007-12-31 at 12:33 -0600, Mikkel L. Ellertson wrote: > John Austin wrote: > > > > The only real decisions are to do with how to boot. > > > > If the USB disk is to rely on the MBR of a main SATA/IDE type disk then > > choose the /dev/sdxy device associated with the USB disk at install > > time. > > Then add an entry to grub.conf on the fixed disk. > > title USB disk > > root (hdp,q) > > chainloader +1 > > > > In addition after install I would then configure grub on the MBR of the > > USB disk as well such that I can boot the disk with and without the > > presence of the "main", "fixed" disk. > > > What I did was install a copy of Grub to the MBR of the USB drive, > and then create an entry like this in the SATA Grub menu: > > title USB disk > root (hd0) > map (hd0) (hd1) > map (hd1) (hd0) > chainload +1 > > Because of the map commands, the USB drive is hd0 when the chainload > command is executed, and it loads Grub from the USB drive. (hd0 is > the entire disk, starting from the MBR.) From there it is the same > as if you had used the BIOS option to boot from the USB drive. The > only thing you have to be careful of is if you have more then one > USB drive plugged in. You will get a Grub error is the wrong one is > detected first, and does not have a boot loader on it. > > Mikkel > -- Hi Mikkel I liked your way of doing things but when I try on my machine as soon as I use the map command grub gets in a real muddle. It is not a problem to me but it should work !!!!!!!!! Even simple things from the grub command start failing Eg I can boot into interactive grub from SATA disk and re enter grub many times as follows With SATA=(hd0) USB=(hd1) (SATA is F8 x86-64, USB is F8 i386) both updated to within 3 days. Both have /dev/sdx1 = /boot, /dev/sdx2 = /, /dev/sdx3 = swap root (hd0) chainloader +1 re-enters the SATA grub menu root (hd1) chainloader +1 enters the USB grub menu root (hd1) chainloader +1 re-enters the USB grub menu root (hd0) chainloader +1 re-enters the SATA grub menu as soon as I do the following grub falls apart !!!!!!!!!! root (hd0) map (hd0) (hd1) map (hd1) (hd0) chainloader +1 Interesting ? John </fedora-list@redhat.com></ja@jaa.org.uk></flddj3$sbo$1@ger.gmane.org></tim@birdsnest.maths.tcd.ie></fedora-list@redhat.com></valent.turkovic@gmail.com></fldd7n$rem$1@ger.gmane.org></tim@birdsnest.maths.tcd.ie></fldcb1$pi2$1@ger.gmane.org></tim@birdsnest.maths.tcd.ie></fldbs3$okn$1@ger.gmane.org></tim@birdsnest.maths.tcd.ie></fedora-list@redhat.com></k5di@zianet.com></fedora-list@redhat.com></k5di@zianet.com></dj@delorie.com></fedora-list@redhat.com></todbot88@gmail.com></fedora@leemhuis.info></fedora-list@redhat.com></valent.turkovic@gmail.com></fedora-list@redhat.com></gilboad@gmail.com></rab@nauticom.net></fedora-list@redhat.com></todbot88@gmail.com></fedora-list@redhat.com></fedora@leemhuis.info></fedora-list@redhat.com></Ed.Greshko@greshko.com></blockquote>