Document : Q150815   05-NOV-1996
Title    : Windows NT may fail to boot on Toshiba laptops
Product  : Microsoft Windows NT
Prod/Ver : 3.51 4.0
Keywords : kbbug3.51 kbbug4.0 kbfix3.51 kbfix4.0 setup

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The information in this article applies to:

 - Microsoft Windows NT Workstation versions 3.51 and 4.0
 - Microsoft Windows NT Server versions 3.51 and 4.0

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SYMPTOMS
========

Windows NT may fail to boot on certain laptops, in particular Toshiba
laptops, when the system partition is located on a NTFS partition that is
other than the boot partition. The following error message appears:

      STOP 0x0000007B
      Inaccessible Boot Device


CAUSE
=====

Problem occurs when the system corrupts the last sectors being written to
disk during shutdown. This appears to be a hardware problem relating to the
drive head and power shutdown which results in an Error Correction Code
(ECC) error when reading the sector on restart.


RESOLUTION
==========

Obtain the following update or wait for the next Service Pack.

A modified ntfs.sys driver for Windows NT and instructions for installing
them are available from Microsoft support channels or directly from the
following Internet locations:

The fix detects the bad sector in the restart area and uses the alternate
restart area during boot.

For Windows NT 3.51:

   ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/NT351
   /hotfixes-postSP5/toshiba-fix

For Windows NT 4.0:

   ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/NT40
   /hotfixes-postSP1/toshiba-fix


STATUS
======

Microsoft has confirmed this to be a problem in Windows NT versions 3.51
and 4.0. A supported update for NTFS driver for Windows NT versions 3.51
and 4.0 are now available, but has not been fully regression-tested and
should be applied only to systems experiencing this specific problem.
Unless you are severely impacted by this specific problem, Microsoft
recommends that you wait for the next Service Pack that contains this
update. Contact Microsoft Product Support Services for more information.


KBCategory: kbbug3.51 kbbug4.0 kbfix3.51 kbfix4.0 setup
KBSubcategory: ntdriver nthw
Additional reference words: prodnt 4.00 3.51


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