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(grub.info)Device syntax

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How to specify devices
======================

   The device syntax is like this:

     `(DEVICE[,PART-NUM][,BSD-SUBPART-LETTER])'

   `[]' means the parameter is optional. DEVICE should be either `fd'
or `hd' followed by a digit, like `fd0'.  But you can also set DEVICE
to a hexadecimal or a decimal, which is a BIOS drive number, so the
following are equivalent:

     (hd0)
     (0x80)
     (128)

   PART-NUM represents the partition number of DEVICE, starting from
zero for primary partitions and from four for extended partitions, and
BSD-SUBPART-LETTER represents the BSD disklabel subpartition, such as
`a' or `e'.

   A shortcut for specifying BSD subpartitions is
`(DEVICE,BSD-SUBPART-LETTER)', in this case, GRUB searches for the
first PC partition containing a BSD disklabel, then finds the
subpartition BSD-SUBPART-LETTER. Here is an example:

     (hd0,a)

   The syntax like `(hd0)' represents using the entire disk (or the MBR
when installing GRUB), while the syntax like `(hd0,0)' represents using
the partition of the disk (or the boot sector of the partition when
installing GRUB).

   If you enabled the network support, the special drive, `(nd)', is
also available. Before using the network drive, you must initialize the
network. Note: Network, for more information.