(grub.info.gz) Naming convention

 
 2 Naming convention
 *******************
 
 The device syntax used in GRUB is a wee bit different from what you may
 have seen before in your operating system(s), and you need to know it so
 that you can specify a drive/partition.
 
    Look at the following examples and explanations:
 
      (fd0)
 
    First of all, GRUB requires that the device name be enclosed with
 `(' and `)'. The `fd' part means that it is a floppy disk. The number
 `0' is the drive number, which is counted from _zero_. This expression
 means that GRUB will use the whole floppy disk.
 
      (hd0,1)
 
    Here, `hd' means it is a hard disk drive. The first integer `0'
 indicates the drive number, that is, the first hard disk, while the
 second integer, `1', indicates the partition number (or the PC slice
 number in the BSD terminology). Once again, please note that the
 partition numbers are counted from _zero_, not from one. This
 expression means the second partition of the first hard disk drive. In
 this case, GRUB uses one partition of the disk, instead of the whole
 disk.
 
      (hd0,4)
 
    This specifies the first "extended partition" of the first hard disk
 drive. Note that the partition numbers for extended partitions are
 counted from `4', regardless of the actual number of primary partitions
 on your hard disk.
 
      (hd1,a)
 
    This means the BSD `a' partition of the second hard disk. If you
 need to specify which PC slice number should be used, use something
 like this: `(hd1,0,a)'. If the PC slice number is omitted, GRUB
 searches for the first PC slice which has a BSD `a' partition.
 
    Of course, to actually access the disks or partitions with GRUB, you
 need to use the device specification in a command, like `root (fd0)' or
 `unhide (hd0,2)'. To help you find out which number specifies a
 partition you want, the GRUB command-line ( Command-line
 interface) options have argument completion. This means that, for
 example, you only need to type
 
      root (
 
    followed by a <TAB>, and GRUB will display the list of drives,
 partitions, or file names. So it should be quite easy to determine the
 name of your target partition, even with minimal knowledge of the
 syntax.
 
    Note that GRUB does _not_ distinguish IDE from SCSI - it simply
 counts the drive numbers from zero, regardless of their type. Normally,
 any IDE drive number is less than any SCSI drive number, although that
 is not true if you change the boot sequence by swapping IDE and SCSI
 drives in your BIOS.
 
    Now the question is, how to specify a file? Again, consider an
 example:
 
      (hd0,0)/vmlinuz
 
    This specifies the file named `vmlinuz', found on the first
 partition of the first hard disk drive. Note that the argument
 completion works with file names, too.
 
    That was easy, admit it. Now read the next chapter, to find out how
 to actually install GRUB on your drive.
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