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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. See section Downloading OS images from a network, for more information.
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