[solved] booting from usb

Question

Hello, I'm not sure if this post should go here but this board seemed the most "generic".
I have an acer aspire one with 8GB of SDD and no swap partition. That's ok for webbrowsing and some of the tasks I would like a netbook for. When I want to compile large programs boot from an arch installation in an external 500GB HD wich I use to bloat and install programs I will probably use once. This worked for me untill I upgraded to HD to 2.6.27 which I needed in order to use it in the AAO (hardware support). Now the USB won't boot.
I start the computer with the HD plugged and puch F12, choose to boot from the external drive and grub appear. Now no matter if I choose the first or second option it will start to boot but won't finish. It complains of the partition not existing. It suggest to add rootdelay=8 or greater to menu.lst, which I tried and doesn't work. When in ramfs$ I do
cd dev
echo *
there is no sdb4 which is the root partition nor any sdb? . When I boot my local install it boots ok and I can se /dev/sdb4.
Any idea?
Last edited by ore (2009-03-23 17:00:51)

Answer 1

when grub comes up hit "e"
then edit initrd line to read like this
initrd /boot/kernel26-fallback.img
if that doesnt work try boot of install cd
http://wiki.archlinux.org/index.php/Boo … recovering
once in you id say you need to edit /etc/mkinitcpio.conf  make sure usb is in hooks. if you have sata or ide drive inside notebook make sure usb hook is after sata or ide hook otherwise usb gets sda & internal drive gets sdb
http://wiki.archlinux.org/index.php/Con … mkinitcpio
then run
mkinitcpio -g /boot/kernel26.img
reboot should do it