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- DOCUMENT:Q100323 28-JAN-1994 [W_NT]
- TITLE :INF: Intel x86-Based System Boot Sequence and Files
- PRODUCT :Windows NT
- PROD/VER:3.10
- OPER/SYS:WINDOWS
- KEYWORDS:
-
- --------------------------------------------------------------------
- The information in this article applies to:
-
- - Microsoft Windows NT operating system version 3.1
- - Microsoft Windows NT Advanced Server version 3.1
- --------------------------------------------------------------------
-
- There are four key files used during the boot process of Windows NT on
- Intel x86-based systems: BOOT.INI, NTLDR, NTDETECT.COM, and
- NTOSKRNL.EXE. They are responsible for starting the Boot Loader,
- building the hardware list, and loading the Windows NT kernel. The
- following describes the steps taken during the boot sequence.
-
- Boot Sequence for x86-Based Machines
- ------------------------------------
-
- 1. Power on self-test (POST).
-
- 2. Find boot device and load boot record (handled by the system
- BIOS). The master boot record (MBR) reads the partition table,
- determines the location of the boot record, and then jumps to that
- sector and begins execution there.
-
- 3. Windows NT bootstrap routine finds and loads NTLDR.
-
- NOTE: Steps 2 and 3 as documented on page 474 of the Windows NT
- System Guide are in reverse, incorrect order. The step order listed
- here is correct.
-
- 4. NTLDR switches processor to 32-bit flat memory mode.
-
- 5. NTLDR reads the BOOT.INI and displays operating system choices.
-
- 6. User selects an operating system (Windows NT in this example).
-
- 7. NTLDR loads NTDETECT.COM.
-
- 8. NTDETECT.COM builds the hardware list. It then passes the list and
- control back to NTLDR. If an operating system other than Windows
- NT is selected, BOOTSECT.DOS is loaded and control is passed to it.
-
- 9. NTLDR loads NTOSKRNL.EXE.
-
- 10. NTOSKRNL.EXE loads and initializes Windows NT using information
- from the Registry to load and initialize drivers and other system
- settings.
-
- Additional reference words: 3.10 filsys winnt
- KBCategory:
- KBSubCategory: BOOTUP DOCER
-
- =============================================================================
-
- THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
- PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS
- ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES
- OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO
- EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR
- ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
- CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
- MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
- POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION
- OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
- SO THE FOREGOING LIMITATION MAY NOT APPLY.
-
- Copyright Microsoft Corporation 1994.