Here is the Joydeep Bakshi’s GBUB guide that is distibuted under Open Content License and covers the following fields:
- MBR, boot sector, boot loader
- Backup & Restore boot loader
- Grub stage1, stage2, stage3 and relation among them
- Making Grub Floppy
- Making Grub CD
- Making Grub Pen drive
- stage1 and stage2 on different media
- Grub’s device and device.map file
- Grub Rescue
- Super Grub Disk
- Grub’S GUI configuration
- Manual booting with Grub shell
- Disk investigation with Grub
Read full guide here…
More useful links:
GNU GRUB
GNU GRUB FAQ
GNU GRUB Manual 0.97
The list of command line and menu entry commands
GNU GRUB on Wikipedia