72 lines
2.7 KiB
Text
72 lines
2.7 KiB
Text
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2 Naming convention
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*******************
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The device syntax used in GRUB is a wee bit different from what you may
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have seen before in your operating system(s), and you need to know it so
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that you can specify a drive/partition.
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Look at the following examples and explanations:
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(fd0)
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First of all, GRUB requires that the device name be enclosed with '('
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and ')'. The 'fd' part means that it is a floppy disk. The number '0'
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is the drive number, which is counted from _zero_. This expression
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means that GRUB will use the whole floppy disk.
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(hd0,msdos2)
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Here, 'hd' means it is a hard disk drive. The first integer '0'
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indicates the drive number, that is, the first hard disk, the string
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'msdos' indicates the partition scheme, while the second integer, '2',
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indicates the partition number (or the PC slice number in the BSD
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terminology). The partition numbers are counted from _one_, not from
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zero (as was the case in previous versions of GRUB). This expression
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means the second partition of the first hard disk drive. In this case,
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GRUB uses one partition of the disk, instead of the whole disk.
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(hd0,msdos5)
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This specifies the first "extended partition" of the first hard disk
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drive. Note that the partition numbers for extended partitions are
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counted from '5', regardless of the actual number of primary partitions
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on your hard disk.
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(hd1,msdos1,bsd1)
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This means the BSD 'a' partition on first PC slice number of the
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second hard disk.
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Of course, to actually access the disks or partitions with GRUB, you
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need to use the device specification in a command, like 'set root=(fd0)'
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or 'parttool (hd0,msdos3) hidden-'. To help you find out which number
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specifies a partition you want, the GRUB command-line (*note
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Command-line interface::) options have argument completion. This means
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that, for example, you only need to type
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set root=(
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followed by a <TAB>, and GRUB will display the list of drives,
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partitions, or file names. So it should be quite easy to determine the
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name of your target partition, even with minimal knowledge of the
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syntax.
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Note that GRUB does _not_ distinguish IDE from SCSI - it simply
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counts the drive numbers from zero, regardless of their type. Normally,
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any IDE drive number is less than any SCSI drive number, although that
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is not true if you change the boot sequence by swapping IDE and SCSI
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drives in your BIOS.
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Now the question is, how to specify a file? Again, consider an
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example:
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(hd0,msdos1)/vmlinuz
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This specifies the file named 'vmlinuz', found on the first partition
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of the first hard disk drive. Note that the argument completion works
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with file names, too.
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That was easy, admit it. Now read the next chapter, to find out how
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to actually install GRUB on your drive.
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