Microsoft KB Archive/136990

= ATDISK Driver Fails to Start After Upgrade =

Article ID: 136990

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Workstation 3.51
 * Microsoft Windows NT Server 3.51

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This article was previously published under Q136990



SYMPTOMS
Your computer uses an enhanced IDE controller and you upgraded your previous installation of Windows NT to Windows NT 3.51. The following message appears when you boot Windows NT:

At least one service or driver failed during system startup. Use Event Viewer to examine the event log for details.

Event Viewer shows that the message is caused by ATDISK.



CAUSE
Computers capable of connecting four Enhanced IDE (EIDE) devices actually contain two separate EIDE adapters. Windows NT 3.51 uses ATAPI.SYS to handle EIDE adapters, whereas ATDISK.SYS is used for only IDE and other WD1003 compatible disk controllers. In Windows NT 3.5, ATDISK.SYS handles the first adapter's IDE drives. ATAPI.SYS handles ATAPI devices, such as CD- ROM drives and hard disks, on the second adapter. When you update to Windows NT 3.51, ATAPI takes over the IO addresses from the first IDE adapter. When ATDISK initializes it cannot allocate the IO addresses and it terminates.



RESOLUTION
To correct this problem,, run Control Panel, choose Devices, and manually disable the ATDISK driver.

Additional query words: prodnt startup system log western digital wd

Keywords: KB136990

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