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Q154647: Setup Halts with "Windows Has Disabled Direct Disk Access"

Article: Q154647
Product(s): Microsoft Windows NT
Version(s): 3.5 3.51 4.0
Operating System(s): 
Keyword(s): kbsetup
Last Modified: 10-AUG-2001

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The information in this article applies to:

- Microsoft Windows NT Server versions 3.5, 3.51, 4.0 
- Microsoft Windows NT Workstation versions 3.5, 3.51, 4.0 
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SYMPTOMS
========

When you are installing Windows NT Workstation or Server version 4.0 from a flat
directory on the hard disk, Setup may halt with the following message after
setting the location of the source files:

  Windows has disabled direct disk access to protect your long file
  names. To override this protection, see the Lock /? Command for more
  information. The system has been halted. Press CTRL-ALT-DEL to restart
  your computer.

CAUSE
=====

This behavior can occur if the Microsoft Windows 95 or Microsoft Windows 98
system files have been installed on the hard disk.

RESOLUTION
==========

Restart the computer, and then type "lock c:" (without quotation marks) at the
command prompt. Windows returns the following message:

  WARNING: The lock command enables direct disk access by programs that can
  CORRUPT file names and/or DESTROY disk data, resulting in the loss of files
  on your disk.

  Are you sure (Y/N)?

Press Y to return to the command prompt, and then run Windows NT Setup again.

MORE INFORMATION
================

Windows 95/98 includes volume-locking code to protect long file names from
programs that make absolute INT25 read and INT26 write disk calls by- passing
the FAT. The Windows 95/98 Command.com includes a LOCK command to allow you to
perform an exclusive read/write lock for use with programs that do not use the
volume-locking APIs included in Windows 95/98.

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Keywords          : kbsetup 
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT351search kbWinNT350search kbWinNT400search kbWinNTW350 kbWinNTW350search kbWinNTW351search kbWinNTW351 kbWinNTSsearch kbWinNTS400search kbWinNTS400 kbWinNTS351 kbWinNTS350 kbWinNTS351search kbWinNTS350search
Version           : 3.5 3.51 4.0

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