Konstantin Svist wrote: > > Oh, okay - that's not so bad then :) > Grub is supposed to see one of the drives as (hd0) and another one as > (hd1). These correspond to physical drives. If you have more than 2 > physical drives, it might be (hd2), etc... > If you used the BIOS to switch between drives (selecting primary boot > drive), then grub will probably change the names around, be careful! > What makes things interesting is that the drive order can change depending on the boot device. If the BIOS defaults to booting off the IDE drive, but you told it to boot off the SATA drive instead, then when you boot off a CD/DVD, the IDE drive may go back to being hd0, instead of the SATA being hd0 when you tell the BIOS to boot off that drive. If you tell it to boot of a USB drive, then the USB drive becomes hd0, the IDE drive is back to hd1, and the SATA drive is hd2. (Actually BIOS drives 80, 81, and 82.) The thing it, this is not Grub (or LILO) doing something, this is the BIOS changing things. Because the installer creates the Grub configuration file based on the drive mapping during install, it doesn't always get things right when you booted off a CD/DVD. The drive mapping the BIOS is using when you do that may not be the mapping when you boot off another device. Because the installer has no way to tell if the current drive mapping is the normal mapping, it is up to the user to verify, and correct as necessary, the drive mapping being used. This is also why partition and volume labels are used by default - that way, once you have fixed the boot loader's configuration file, Linux can boot without changes. But if you are doing more then one Linux install, pick good labels instead of using the default ones. This is also a good idea if you expect to move the drive to another system for repair, data recovery, etc... Mikkel -- Do not meddle in the affairs of dragons, for thou art crunchy and taste good with Ketchup!
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