This article was previously published under Q125933
After you have installed Windows NT version with an IDE CD-ROM that isdaisy chained with your IDE hard disk, and have configured the CD-ROM as aslave and the hard disk as the master, the following STOP message appearswhen you reboot after removing the CD-ROM:
STOP 0x0000007B Inaccessible Boot Device
During the installation of Windows NT, ATAPI.SYS, not ATDISK.SYS, is copiedto the <%systemroot%>\SYSTEM32\DRIVERS subdirectory.
If you encounter this error, always check to make sure that the system isnot infected with a virus, particularly a boot sector virus.
Before you remove the IDE CD-ROM, do the following:
If you are running Windows NT 3.5 or 3.51, go to the Windows NT Setupprogram and choose Add/Remove SCSI Adapters. If you are running WindowsNT 4.0, go to the SCSI Adapters option in Control Panel.
Select "IDE CD-ROM (ATAPI 1.2)" and choose Remove. Exit of Windows NT Setup, or the Control Panel.
In Control Panel, choose the Devices icon.
Select the device ATAPI and choose Startup. For Startup Type, select Disabled and choose OK.
If there are no SCSI disks installed in the system, select the device SCSIDISK and choose Startup. For Startup Type, select Disabled and choose OK.
Select the device ATDISK and choose Startup. For Startup Type, select Boot and choose OK.
Copy ATDISK.SYS from the \I386 subdirectory of the Windows NT Server or Workstation version 3.5 CD to the <%systemroot>\SYSTEM32\DRIVERS subdirectory.
Shutdown Windows NT and remove the CD-ROM. Change the jumper configuration on the hard disk from Master to Stand-alone.
Microsoft has confirmed this to be a problem in the Windows NT versionslisted above. We are researching this problem and will post newinformation here in the Microsoft Knowledge Base if it becomes available.