When you access a SATA device that supports the Native Command Queuing (NCQ) feature in Windows Vista or in Windows Server 2008, you may experience poor performance

Symptoms

On a Windows Vista-based or Windows Server 2008-based computer, you have a Serial Advanced Technology Attachment (SATA) device that supports the Native Command Queuing (NCQ) feature. However, you may experience poor performance when you access the SATA device.

This problem occurs if the computer uses the Microsoft AHCI driver (Msahci.sys). The SATA device supports queue depths of greater than 1 and less than 32. However, the Microsoft AHCI driver incorrectly sets the queue depth on the SATA device. In this case, NCQ is disabled for the SATA device.

Resolution

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=supportNote The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Important Windows Vista and Windows Server 2008 hotfixes are included in the same packages. However, only one of these products may be listed on the “Hotfix Request” page. To request the hotfix package that applies to both Windows Vista and Windows Server 2008, just select the product that is listed on the page.

Prerequisites


To apply this hotfix on a Windows Vista-based computer, you must have Windows Vista SP1 installed. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

935791 How to obtain the latest Windows Vista service pack

No prerequisites are required for Windows Server 2008-based computers.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) 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 item in Control Panel.

Windows Vista and Windows Server 2008 file information notes

The MANIFEST files (.manifest) and MUM files (.mum) installed for each environment are
listed separately. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component. The security catalog files (attributes not listed) are signed with a Microsoft digital signature.

For all supported 32-bit versions of Windows Server 2008 and of Windows Vista

File name

File version

File size

Date

Time

Platform

Aliide.sys

1.2.0.0

15,624

15-Dec-2008

06:08

x86

Amdide.sys

6.0.6001.22330

16,136

15-Dec-2008

06:08

x86

Atapi.sys

6.0.6001.22330

19,720

15-Dec-2008

06:08

x86

Ataport.sys

6.0.6001.22330

108,296

15-Dec-2008

06:10

x86

Cmdide.sys

2.0.7.0

17,160

15-Dec-2008

06:08

x86

Intelide.sys

6.0.6001.22330

16,136

15-Dec-2008

06:08

x86

Msahci.sys

6.0.6001.22330

26,888

15-Dec-2008

06:08

x86

Pciide.sys

6.0.6001.22330

14,600

15-Dec-2008

06:07

x86

Pciidex.sys

6.0.6001.22330

43,272

15-Dec-2008

06:07

x86

Viaide.sys

5.1.3790.150

18,184

15-Dec-2008

06:07

x86

For all supported 64-bit versions of Windows Server 2008 and of Windows Vista

File name

File version

File size

Date

Time

Platform

Aliide.sys

1.2.0.0

16,648

15-Dec-2008

06:49

x64

Amdide.sys

6.0.6001.22330

16,648

15-Dec-2008

06:51

x64

Atapi.sys

6.0.6001.22330

20,744

15-Dec-2008

06:49

x64

Ataport.sys

6.0.6001.22330

123,144

15-Dec-2008

06:51

x64

Cmdide.sys

2.0.7.0

18,696

15-Dec-2008

06:49

x64

Intelide.sys

6.0.6001.22330

17,672

15-Dec-2008

06:51

x64

Msahci.sys

6.0.6001.22330

29,448

15-Dec-2008

06:51

x64

Pciide.sys

6.0.6001.22330

14,600

15-Dec-2008

06:51

x64

Pciidex.sys

6.0.6001.22330

49,416

15-Dec-2008

06:51

x64

Viaide.sys

5.1.3790.150

18,696

15-Dec-2008

06:52

x64

For all supported Itanium-based versions of Windows Server 2008

File name

File version

File size

Date

Time

Platform

Aliide.sys

1.2.0.0

20,232

15-Dec-2008

04:42

IA-64

Atapi.sys

6.0.6001.22330

36,616

15-Dec-2008

04:42

IA-64

Ataport.sys

6.0.6001.22330

306,952

15-Dec-2008

04:42

IA-64

Cmdide.sys

2.0.7.0

27,912

15-Dec-2008

04:42

IA-64

Intelide.sys

6.0.6001.22330

22,280

15-Dec-2008

04:42

IA-64

Msahci.sys

6.0.6001.22330

60,680

15-Dec-2008

04:42

IA-64

Pciide.sys

6.0.6001.22330

19,720

15-Dec-2008

04:42

IA-64

Pciidex.sys

6.0.6001.22330

109,832

15-Dec-2008

04:42

IA-64

Viaide.sys

5.1.3790.150

29,448

15-Dec-2008

04:42

IA-64

Status

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

More Information

For more information about NCQ, visit the following Web site:

http://download.microsoft.com/download/5/b/5/5b5bec17-ea71-4653-9539-204a672f11cf/Seagate_sataNCQ.pdfFor more information about SSD, visit the following Web site:

http://download.microsoft.com/download/a/f/d/afdfd50d-6eb9-425e-84e1-b4085a80e34e/WNS-T432_WH07.pptx

Additional file information for Windows Server 2008 and for Windows Vista

Additional files for all supported 32-bit versions of Windows Server 2008 and of Windows Vista

File name

Package_for_kb960735_client_1~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,367

Date (UTC)

16-Dec-2008

Time (UTC)

00:52

File name

Package_for_kb960735_client~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,431

Date (UTC)

16-Dec-2008

Time (UTC)

00:52

File name

Package_for_kb960735_sc_0~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,421

Date (UTC)

16-Dec-2008

Time (UTC)

00:52

File name

Package_for_kb960735_sc~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,423

Date (UTC)

16-Dec-2008

Time (UTC)

00:52

File name

Package_for_kb960735_server_0~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,425

Date (UTC)

16-Dec-2008

Time (UTC)

00:52

File name

Package_for_kb960735_server~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,431

Date (UTC)

16-Dec-2008

Time (UTC)

00:52

File name

Package_for_kb960735_winpesrv_0~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,422

Date (UTC)

16-Dec-2008

Time (UTC)

00:52

File name

Package_for_kb960735_winpesrv~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,429

Date (UTC)

16-Dec-2008

Time (UTC)

00:52

File name

X86_mshdc.inf_31bf3856ad364e35_6.0.6001.22330_none_dda158ed3abfbc87.manifest

File version

Not Applicable

File size

6,874

Date (UTC)

16-Dec-2008

Time (UTC)

00:54

Additional files for all supported 64-bit versions of Windows Server 2008 and of Windows Vista


File name

Amd64_mshdc.inf_31bf3856ad364e35_6.0.6001.22330_none_39bff470f31d2dbd.manifest

File version

Not Applicable

File size

6,876

Date (UTC)

16-Dec-2008

Time (UTC)

00:56

File name

Package_for_kb960735_client_1~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,375

Date (UTC)

16-Dec-2008

Time (UTC)

00:52

File name

Package_for_kb960735_client~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,439

Date (UTC)

16-Dec-2008

Time (UTC)

00:52

File name

Package_for_kb960735_sc_0~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,429

Date (UTC)

16-Dec-2008

Time (UTC)

00:52

File name

Package_for_kb960735_sc~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,431

Date (UTC)

16-Dec-2008

Time (UTC)

00:52

File name

Package_for_kb960735_server_0~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,433

Date (UTC)

16-Dec-2008

Time (UTC)

00:52

File name

Package_for_kb960735_server~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,439

Date (UTC)

16-Dec-2008

Time (UTC)

00:52

File name

Package_for_kb960735_winpesrv_0~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,430

Date (UTC)

16-Dec-2008

Time (UTC)

00:52

File name

Package_for_kb960735_winpesrv~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,437

Date (UTC)

16-Dec-2008

Time (UTC)

00:52

Additional files for all supported Itanium-based versions of Windows Server 2008

File name

Ia64_mshdc.inf_31bf3856ad364e35_6.0.6001.22330_none_dda2fce33abdc583.manifest

File version

Not Applicable

File size

6,297

Date (UTC)

16-Dec-2008

Time (UTC)

00:52

File name

Package_for_kb960735_sc_0~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not Applicable

File size

1,425

Date (UTC)

16-Dec-2008

Time (UTC)

00:52

File name

Package_for_kb960735_sc~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not Applicable

File size

1,426

Date (UTC)

16-Dec-2008

Time (UTC)

00:52

File name

Package_for_kb960735_server_0~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not Applicable

File size

1,429

Date (UTC)

16-Dec-2008

Time (UTC)

00:52

File name

Package_for_kb960735_server~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not Applicable

File size

1,434

Date (UTC)

16-Dec-2008

Time (UTC)

00:52

File name

Package_for_kb960735_winpesrv_0~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not Applicable

File size

1,426

Date (UTC)

16-Dec-2008

Time (UTC)

00:52

File name

Package_for_kb960735_winpesrv~31bf3856ad364e35~ia64~~6.0.1.0.mum

File version

Not Applicable

File size

1,433

Date (UTC)

16-Dec-2008

Time (UTC)

00:52

Need more help?

Expand your skills
Explore Training
Get new features first
Join Microsoft Insiders

Was this information helpful?

Thank you for your feedback!

Thank you for your feedback! It sounds like it might be helpful to connect you to one of our Office support agents.

×