On Apr 26, 2005, at 12:51 PM, Mark A. Nicolosi wrote:
Grub uses its own naming structure for drives and partitions in the form
of (hdn,m), where n is the hard drive number and m is the partition
number, both starting from zero. For example, partition hda1 is (hd0,0)
to Grub and hdb3 is (hd1,2). In contrast to Linux, Grub does not
consider CD-ROM drives to be hard drives. For example, if using a CD on
hdb and a second hard drive on hdc, that second hard drive would still
be (hd1).
I think the book should mention something like "If you're computer has SCSI disks and you don't have any IDE disks, sda would be (hd0)." But made to fit better into the paragraph. Hope that makes sense ;-)
Or maybe something that more completely describes the way that grub chooses names like:
Grub uses its own naming structure for drives and partitions in the form of (hdn,m), where n is the hard drive number and m is the partition number, both starting from zero. Grub does not distinguish between busses, but simply names disks in the same order they are presented by your BIOS, skipping any optical drives. While the particular order of disks that grub chooses is BIOS dependent, /dev/hda or /dev/sda are usually considered hd0 by grub.
For example, on an IDE-based machine with a hard drive at /dev/hda, a CD drive at /dev/hdc, and a second hard drive at /dev/hde, grub would likely present the first hard drive as hd0, the second hard drive as hd1, and would not present the CD drive at all.
Zach
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