Ok, I saw many reports at ubuntuforums, launchpad, etc. where users complain about Grub loading slowly when the boot partition or MBR is not on sda. An usb disk is usually sdb, sdc... Moreover, when installing Ubuntu on sda my notebooks boot instantly. I'll check out Grub's source code, but I seem to recall that Canonical also added some code to its own version.
Ok, I saw many reports at ubuntuforums, launchpad, etc. where users complain about Grub loading slowly when the boot partition or MBR is not on sda. An usb disk is usually sdb, sdc... Moreover, when installing Ubuntu on sda my notebooks boot instantly. I'll check out Grub's source code, but I seem to recall that Canonical also added some code to its own version.