Difference between revisions 2947742 and 2947746 on enwikibooks

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== Boot Process for Operating Systems ==

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=== WIN95/98/ME BOOT PROCESS  (Similar to DOS) ===

# POST is performed.
# Master Boot Record (MBR) is loaded into RAM and locates the boot sector.  The boot sector then locates the Io.sys.
# The Io.sys runs Sysinit and loads Msdos.sys into RAM.
# Io.sys then loads System.dat, but does not process at this time.
# Io.sys then loads Config.sys and Autoexec.bat.  These are not necessary to load the operating system, but are needed when 16 bit (real mode) drivers are used.
# Io.sys then loads Win.com which start the operating system.
# Win.com loads drivers specified by the registry.
# Win.com processes the System.ini and Win.ini files.  System.ini is used to configure the memory cache and buffers.  Win.ini is used for 16-bit applications.  Otherwise, they are run by the registry.
# Win.com will start KERNEL32.DLL, KERNEL386.EXE, GDI.EXE, and  GDI32.EXE.  The Kernel files are the operating systems.  The GDI files are responsible for the graphical functions and display.
# The Kernel files will load the Explorer user interface, which includes the Desktop, Taskbar, and Start Menu.
# The Kernel will then process anything in the Startup folder and restore network connections.
# The user can now interact with the operating system.⏎
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=== WIN2000/NT/XP BOOT PROCESS ===

# BIOS runs POST.
# Computer finds the boot device and loads Master Boot Record (MBR) into RAM.
# MBR looks for the active partition on the boot device and loads the boot sector.
# The boot sector in turn starts the Ntldr file which will load the operating system.
# Ntldr configures the computer’s processor to recognize all of the memory.
# Ntldr will start the file system, and the operating system will load, whether it is FAT or NTFS.
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