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STOP 0x0000007B INACCESSIBLE_BOOT_DEVICE After Applying Windows NT 4.0 Service Pack 4

This article was previously published under Q214810
SYMPTOMS
In some instances, after the application of Service Pack 4, when the computer is restarted, it will do either of the following:

  • The system willfail to boot and will display the following error:
    Stop 0x0000007B INACCESSIBLE_BOOT_DEVICE
  • The system will boot, but some devices will not be recognized on the SCSI bus.
CAUSE
This problem occurs because the Aic78xx.sys driver chosen during the application of Service Pack 4 is not compatible with the computer's Adaptec SCSI controller.
RESOLUTION
This problem can be corrected by replacing the existing Aic78xx.sys driver, located in the %systemroot%\Winnt\System32\Drivers folder, with the Aic78xx.sys driver from the i386 directory within Service Pack 4.

Windows NT 4.0 Service Pack 4 contains the following Aic78xx drivers:
Aic78xx.sys 26,704 bytes
Aic78xx.001 56,272 bytes
To determine which Aic78xx.sys driver is in use, and to copy the correct driver, depends upon the file system on the Windows NT boot partition (where %SystemRoot%\Winnt resides).

If Windows NT resides on a FAT formatted partition, perform the following steps:

  1. Boot to MS-DOS by using an MS-DOS 6.x boot floppy disk.
  2. Change to the %systemroot%\Winnt\System32\Drivers folder.
  3. Compare the size of AIC78xx.sys with the table above.
  4. Replace the existing AIC78xx.sys file in %systemroot%\Winnt\System32\Drivers with the other AIC78xx file in the i386 directory within Serivce Pack 4.
  5. If AIC78xx.001 is copied, be sure to rename it AIC78xx.sys.
If Windows NT resides on an NTFS formatted partition, perform the following steps:

  1. Either boot to a parallel installation of Windows NT or create a parallel installation of Windows NT. To create a parallel copy of Windows NT, perform a fresh installation of Windows NT to a different folder.
  2. From the parallel installation, look in the %systemroot%\Winnt\System32\Drivers of the failing copy of Windows NT.
  3. Compare the size of AIC78xx.sys with the table above.
  4. Replace the existing AIC78xx.sys file in %systemroot%\Winnt\System32\Drivers with the other AIC78xx file in the i386 directory within Serivce Pack 4.
  5. If AIC78xx.001 is copied, be sure to rename it AIC78xx.sys.
MORE INFORMATION
There are two different versions of the AIC78XX driver for the Adaptec 2940 and 7800 family of SCSI controllers included in Service Pack 4. The Aic78xx.sys file in Service Pack 4 is the same file that is in Service Pack 3. The Aic78xx.001 file of Service Pack 4 is only placed on the computer if %systemroot%\Winnt\System32\Drivers\AIC78xx.sys has a revision between x.x.1382.x and x.x.1420.x.
Stop 0x0000007B AHA-2940 nt 4.00 sp4
Properties

Article ID: 214810 - Last Review: 11/01/2006 03:32:58 - Revision: 1.1

  • Microsoft Windows NT Server 4.0 Standard Edition
  • Microsoft Windows NT Workstation 4.0 Developer Edition
  • kbnofix kbprb KB214810
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