1 Module 18 The Windows NT Boot Process

2  Overview Overview of the Windows NT Boot Process Troubleshooting the Boot Process Last Known Good Configuration Emergency Repair

3 Files Required for System Boot The Intel x 86 Boot Sequence The RISC Boot Sequence  Overview of the Windows NT Boot Process

4 Files Required for System Boot RISCRISC Osloader.exe *.pal (Alpha only) Ntoskrnl.exe System Device Drivers Osloader.exe *.pal (Alpha only) Ntoskrnl.exe System Device Drivers Intel x 86 Ntldr Boot.ini Bootsect.dos Ntdetect. com Ntboot.sys (SCSI only) Ntoskrnl.exe System Device Drivers Ntldr Boot.ini Bootsect.dos Ntdetect. com Ntboot.sys (SCSI only) Ntoskrnl.exe System Device Drivers

5 The Intel x 86 Boot Sequence Boot Sequence Preboot Sequence Change Processor to Flat Memory Model Start Minifile System Read Boot.ini and Build Selection Screen Load and Initialize Windows NT Load the Correct Operating System Power On Self Test Boot Sector from Active Partition Is Loaded into Memory Boot Sector from Active Partition Is Loaded into Memory Ntldr Is Loaded Master Boot Record Is Loaded and Its Program Is Run Master Boot Record Is Loaded and Its Program Is Run Load Bootsect.dos Not NT Run Ntdetect.com 5 NT

6 The RISC Boot Sequence Boot SequencePreboot Sequence Osloader.exe Load and Initialize Windows NT 1 2 ROM Firmware Selects a Boot Device The Firmware Verifies That File System Is Supported The Firmware Finds Osloader.exe in the Root Directory, Loads It, and Passes Control to It The Firmware Finds Osloader.exe in the Root Directory, Loads It, and Passes Control to It The Firmware Determines If Bootable Partition Is Present

7  Troubleshooting the Boot Process Common Boot Process Errors The Boot.ini File Boot.ini Problems Troubleshooting Boot.ini Problems Creating a Windows NT Boot Disk

8 Common Boot Process Errors Missing Ntldr Missing Ntdetect.com Missing Ntoskrnl.exe Missing Bootsect.dos in a Multiple-boot Configuration

9 [boot loader] timeout=30 default=multi(0)disk(0)rdisk(0)partition(1)\WINNT [operating systems] multi(0)disk(0)rdisk(0)partition(1)\WINNT="Windows NT Workstation Version 4.0" multi(0)disk(0)rdisk(0)partition(1)\WINNT="Windows NT Workstation Version 4.0 [VGA mode]" /basevideo C:\="Microsoft Windows" [boot loader] timeout=30 default=multi(0)disk(0)rdisk(0)partition(1)\WINNT [operating systems] multi(0)disk(0)rdisk(0)partition(1)\WINNT="Windows NT Workstation Version 4.0" multi(0)disk(0)rdisk(0)partition(1)\WINNT="Windows NT Workstation Version 4.0 [VGA mode]" /basevideo C:\="Microsoft Windows" The Boot.ini File

10 Troubleshooting Boot.ini Problems Windows NT Is Automatically Booted New Boot Loader Operating System Selection Menu Item Appears Invalid Windows NT Path Name Invalid Device in Windows NT Path

11 Creating a Windows NT Boot Disk Required Boot Files for Intel-Based Computers Ntldr Ntdetect.com Boot.ini Ntbootdd.sys (for computers with a BIOS-disabled SCSI adapter) Required Boot Files for RISC-Based Computers Osloader.exe Hal.dll *.pal (Alpha)

12 Last Known Good Configuration Logon Last Known Good If Successful, the Last Known Good Configuration Is Saved If Unsuccessful, the Last Known Good Configuration Is Tried

13  Emergency Repair Creating and Updating an Emergency Repair Disk The Emergency Repair Process

14 Creating and Updating an Emergency Repair Disk Emergency Repair Disk Update Repair Info Create Repair Disk Setup.log Files included in the \Repair directory and on the Emergency Repair disk Rdisk

15 The Emergency Repair Process Inspect the Registry Files Inspect the Startup Environment Verify Windows NT System Files Inspect Boot Sector

16 Review Overview of the Windows NT Boot Process Troubleshooting the Boot Process Last Known Good Configuration Emergency Repair