(grub.info.gz) Images

 
 10 GRUB image files
 *******************
 
 GRUB consists of several images: two essential stages, optional stages
 called "Stage 1.5", one image for bootable CD-ROM, and two network boot
 images. Here is a short overview of them.  Internals, for more
 details.
 
 `stage1'
      This is an essential image used for booting up GRUB. Usually, this
      is embedded in an MBR or the boot sector of a partition. Because a
      PC boot sector is 512 bytes, the size of this image is exactly 512
      bytes.
 
      All `stage1' must do is to load Stage 2 or Stage 1.5 from a local
      disk. Because of the size restriction, `stage1' encodes the
      location of Stage 2 (or Stage 1.5) in a block list format, so it
      never understand any filesystem structure.
 
 `stage2'
      This is the core image of GRUB. It does everything but booting up
      itself. Usually, this is put in a filesystem, but that is not
      required.
 
 `e2fs_stage1_5'
 `fat_stage1_5'
 `ffs_stage1_5'
 `jfs_stage1_5'
 `minix_stage1_5'
 `reiserfs_stage1_5'
 `vstafs_stage1_5'
 `xfs_stage1_5'
      These are called "Stage 1.5", because they serve as a bridge
      between `stage1' and `stage2', that is to say, Stage 1.5 is loaded
      by Stage 1 and Stage 1.5 loads Stage 2. The difference between
      `stage1' and `*_stage1_5' is that the former doesn't understand
      any filesystem while the latter understands one filesystem (e.g.
      `e2fs_stage1_5' understands ext2fs). So you can move the Stage 2
      image to another location safely, even after GRUB has been
      installed.
 
      While Stage 2 cannot generally be embedded in a fixed area as the
      size is so large, Stage 1.5 can be installed into the area right
      after an MBR, or the boot loader area of a ReiserFS or a FFS.
 
 `stage2_eltorito'
      This is a boot image for CD-ROMs using the "no emulation mode" in
      El Torito specification. This is identical to Stage 2, except that
      this boots up without Stage 1 and sets up a special drive `(cd)'.
 
 `nbgrub'
      This is a network boot image for the Network Image Proposal used
      by some network boot loaders, such as Etherboot. This is mostly
      the same as Stage 2, but it also sets up a network and loads a
      configuration file from the network.
 
 `pxegrub'
      This is another network boot image for the Preboot Execution
      Environment used by several Netboot ROMs. This is identical to
      `nbgrub', except for the format.
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