Stop Error Messages Occur When Atapi.sys Maps ATA Error Register Bit 01h

View products that this article applies to.

SYMPTOMS

When you start or try to log on to your Microsoft Windows NT Server 4.0 computer, the operating system stops responding, and you receive a Stop error message that is similar to one of the following:

STOP 0x0000001E (0xc0000006, 0xA011C102, 0x00000000, 0xA011C102)
KMODE_EXCEPTION_NOT_HANDLED

STOP 0xC000021A Unknown Hard Error
Unknown Hard Error

Note The Stop 0x0000001E error occurs in the address space for the Win32k.sys process.

After you restart your computer, the following events are logged in the system event log:

Event ID: 7
Source: Ftdisk
Type: Error
Description:
The fault tolerance set containing device \Device\Harddisk0\Ft1 has been disabled
0000: 00000000 00560001 00000000 c0050007
0010: c0040004 00000000 00000001 00000000
0020: 00000000 00000000

Event ID: 23
Source: Ftdisk
Type: Error
Description:
Initialization of a mirror failed.
0000: 00000000 00560001 00000000 c0050017
0010: c0000010 c0000010 00000002 00000000
0020: 00000000 00000000

Note Status c0000010 is the status that Advanced Technology (AT) Attachment Packet Interface (API) returns to the Windows fault-tolerant disk driver (Ftdisk.sys).

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CAUSE

This problem may occur if your Windows NT Server 4.0 computer uses disk mirroring. Disk mirroring is also known as redundant array of independent disks (RAID) level 1. The Windows fault-tolerant disk driver (Ftdisk.sys) disables a mirror set and fails synchronization of the mirrored disks if both of the following conditions occur:

Ftdisk.sys encounters an input/output (I/O) error on the boot partition of the master disk in the mirror set.
Ftdisk.sys receives a status back from the mirrored hard disk that experiences the I/O error that is different from the STATUS_DEVICE_DATA_ERROR (0xC000009C) status and the STATUS_CRC_ERROR (0xC000003F) status.

The integrated device electronics (IDE) port driver, Atapi.sys, maps AT Attachment (ATA) error register bit 01h to the ILI (IDE_ERROR_ILLEGAL_LENGTH) error. Error register bit 01h is the error that hard disks sometimes return when they encounter a bad sector. This mapping causes the 0xc00000010 STATUS_INVALID_DEVICE_REQUEST status to be returned to Ftdisk.sys. If the I/O error occurs on the boot partition and if Ftdisk.sys disables the mirror set, page errors may occur when the operating system tries to perform a read operation. These page errors cause the operating system to stop unexpectedly and to report one of the Stop error messages that are mentioned in the "Symptoms" section.

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RESOLUTION

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support (http://support.microsoft.com/contactus/?ws=support)

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question. The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.

Date         Time    Version         Size      File name
----------------------------------------------------------
11-Nov-2003  13:23   4.0.1381.7247   28,016    Atapi.sys

Note Because of file dependencies, this hotfix requires Microsoft Windows NT 4.0 Service Pack 6a.

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STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section of this article.

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MORE INFORMATION

After you apply this hotfix, Atapi.sys maps the ATA error register bit 01h to the obsolete address mark not found (AMNF) error and returns the STATUS_DEVICE_DATA_ERROR (0xC000009C) status.

Note The ATA error register bit 01h is considered obsolete, but it still can be used according to the ATA backward-compatibility specification.

For additional information about IDE terminology, click the following article number to view the article in the Microsoft Knowledge Base:

262969 (http://support.microsoft.com/kb/262969/ ) Definitions of Common Integrated Drive Electronics (IDE) Terms

For additional information about the standard terminology that is used to describe Microsoft software updates, click the following article number to view the article in the Microsoft Knowledge Base:

824684 (http://support.microsoft.com/kb/824684/ ) Description of the Standard Terminology That Is Used to Describe Microsoft Software Updates

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