72 lines
2.7 KiB
Plaintext
72 lines
2.7 KiB
Plaintext
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,msdos2)
|
|
|
|
Here, 'hd' means it is a hard disk drive. The first integer '0'
|
|
indicates the drive number, that is, the first hard disk, the string
|
|
'msdos' indicates the partition scheme, while the second integer, '2',
|
|
indicates the partition number (or the PC slice number in the BSD
|
|
terminology). The partition numbers are counted from _one_, not from
|
|
zero (as was the case in previous versions of GRUB). 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,msdos5)
|
|
|
|
This specifies the first "extended partition" of the first hard disk
|
|
drive. Note that the partition numbers for extended partitions are
|
|
counted from '5', regardless of the actual number of primary partitions
|
|
on your hard disk.
|
|
|
|
(hd1,msdos1,bsd1)
|
|
|
|
This means the BSD 'a' partition on first PC slice number of the
|
|
second hard disk.
|
|
|
|
Of course, to actually access the disks or partitions with GRUB, you
|
|
need to use the device specification in a command, like 'set root=(fd0)'
|
|
or 'parttool (hd0,msdos3) hidden-'. To help you find out which number
|
|
specifies a partition you want, the GRUB command-line (*note
|
|
Command-line interface::) options have argument completion. This means
|
|
that, for example, you only need to type
|
|
|
|
set 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,msdos1)/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.
|
|
|