GNU Info

(grub.info)Block list syntax

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Enter node , (file) or (file)node

How to specify block lists
==========================

   A block list is used for specifying a file that doesn't appear in the
filesystem, like a chainloader. The syntax is
`[OFFSET]+LENGTH[,[OFFSET]+LENGTH]...'.  Here is an example:

     `0+100,200+1,300+300'

   This represents that GRUB should read blocks 0 through 99, block 200,
and blocks 300 through 599. If you omit an offset, then GRUB assumes
the offset is zero.

   Like the file name syntax (Note: File name syntax), if a blocklist
does not contain a device name, then GRUB uses GRUB's "root device". So
`(hd0,1)+1' is the same as `+1' when the root device is `(hd0,1)'.