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NTLDR (abbreviation of ''NT loader'') is the boot loader for all releases of Windows NT operating system up to and including Windows XP and Windows Server 2003. NTLDR is typically run from the primary hard disk drive, but it can also run from portable storage devices such as a CD-ROM, USB flash drive, or floppy disk. NTLDR can also load a non NT-based operating system given the appropriate boot sector in a file. NTLDR requires, at the minimum, the following two files to be on the system volume: * ntldr, the main boot loader itself * NTDETECT.COM, required for booting an NT-based OS, detects basic hardware information needed for successful boot An additional important file is ''boot.ini'', which contains boot configuration (if missing, NTLDR will default to ''\Windows'' on the first partition of the first hard drive). NTLDR is launched by the volume boot record of system partition, which is typically written to the disk by the Windows FORMAT or SYS command. ==History== Windows NT was originally designed for ARC-compatible platforms, relying on its boot manager support and providing only ''osloader.exe'', a loading program accepting ordinary command-line arguments specifying Windows directory partition, location or boot parameters, which is launched by ARC-compatible boot manager when a user chooses to start specific Windows NT operating system. But because the x86 lacked any of the ARC support, the additional layer was added specifically for that platform: custom boot manager code presenting text menu allowing the user to choose from one or more operating system and its options configured in ''boot.ini'' configuration file, prepended by special StartUp module which is responsible for some preparations such as switching the CPU to the protected mode. When a user chooses an operating system from the boot menu, the following command-line arguments are then passed to the part of the ''osloader.exe'' common to all processor architectures: In Windows versions starting from Windows Vista and Windows Server 2008, NTLDR has been split off back to its boot manager and system loader parts: the Windows Boot Manager and ''winload.exe''. The boot manager part has been completely rewritten, it no longer uses ''boot.ini'' as a configuration file, although the ''bootcfg'' utility for modifying boot.ini is still present for the case of multi-boot configurations with Windows versions up to Windows XP and Windows Server 2003. The bootsect.exe utility program in the Windows PE tools has options /nt52 (NTLDR) and /nt60 (Vista and up) to store a NTLDR or Vista boot record in the first sector of a specified partition. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「NTLDR」の詳細全文を読む スポンサード リンク
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