All the Details of many versions of both MBR and OS Boot Records http://www.geocities.com/thestarman3/asm/mbr/MBR_in_detail.htm These pages will probably always be in a state of flux (change) as we keep gathering new data for Boot Records, filling in Assembly code comments and adding important topics related to booting up your box (computer)! Index to MBR and OS Boot Records (with COLOR highlighting): Understanding Disk Drive Terminology From Floppy Diskette media to Hard Disks (Page2 now covers drives over 8.4 GB in detail.) Understanding Partition Tables Miscellanious Topics ( BOOT.INI file, Data Recovery, 137GB Limit, etc.) MBR (Master Boot Record): Specific Types of Code/Structures All about MS-FDISK What does MS-FDISK Do to a Hard Drive? The Windows 2000/XP MBR The Windows MBR for FAT32 (DOS 7.1) The Standard (DOS 3.30 through 7.0) MBR Notes on the DOS 3.30 MBR The original IBM DOS 2.00 MBR Others.... OS Volume Boot Record Sectors For Floppy DisksThe original IBM PC DOS 1.00 Boot Record The original IBM PC DOS 1.10 Boot Record For Hard Disks NTFS Boot Sector . NT-type Boot Sector . MSWIN4.1 Boot Records . Boot Managers The Windows 2000/XP/2003's BOOT.INI Menu system LILO Boot Manager GRUB Boot Manager