While normal boot loaders keep a table of blocks on the hard disk, GRUB can browse the file system. At the moment, it supports these filesystems:

• Ext2fs
• BSD UFS
• ReiserFS
• SGI's XFS
• VFAT

External link

• GRUB homepage
• Linux+Win+Grub HowTo
• Linux Recovery and Boot Disk Creation with Grub.
• http://www.skyjammer.com/files/knoppix/ Win32 Grub