Symptoms

On a computer that is running Windows Vista or Windows Server 2008, the Ntfs.sys driver takes a long time (several seconds or minutes) to mount a large volume.

This issue causes a delay in volume arrival and in volume mounting. Therefore, applications and services may be unable to access the volume.

Cause

During the volume mounting process, the Ntfs.sys driver reads the $Bitmap file to retrieve the number of free clusters in the current volume. If the file size of the $Bitmap file is large and the current cluster size is set to a small value such as the default cluster size, the Ntfs.sys driver requires a long time to read the file.

Note The file size of the $Bitmap file is large if the volume size is large.

Resolution

After you apply the following hotfix, the Ntfs.sys driver pre-fetches the subsequent pages of the $bitmap file to improve performance.

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 this specific problem.

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, submit a request to 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.

Prerequisites

To apply this hotfix, you must be running one of the following operating systems:

  • Windows Vista Service Pack 1 (SP1)

  • Windows Vista Service Pack 2 (SP2)

  • Windows Server 2008

  • Windows Server 2008 Service Pack 2 (SP2)

For more information about how to obtain a Windows Vista service pack, click the following article number to view the article in the Microsoft Knowledge Base:

935791 How to obtain the latest Windows Vista service pack

For more information about how to obtain a Windows Server 2008 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

968849 How to obtain the latest service pack for Windows Server 2008

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows Vista and Windows Server 2008 file information notes

Important Windows Vista hotfixes and Windows Server 2008 hotfixes are included in the same packages. However, only "Windows Vista" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows Vista" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

  • The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.

    Version

    Product

    SR_Level

    Service branch

    6.0.600
    1.
    22xxx

    Windows Vista and Windows Server 2008

    SP1

    LDR

    6.0.600
    2.
    22xxx

    Windows Vista and Windows Server 2008

    SP2

    LDR

  • Service Pack 1 is integrated into the release version of Windows Server 2008. Therefore, RTM milestone files apply only to Windows Vista. RTM milestone files have a 6.0.0000.xxxxx version number.

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 and for Windows Vista" section. MUM files and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows Server 2008 and of Windows Vista

File name

File version

File size

Date

Time

Platform

Ntfs.sys

6.0.6001.22882

1,080,720

18-Mar-2011

18:27

x86

Ntfs.sys

6.0.6002.22616

1,082,768

18-Mar-2011

18:27

x86

For all supported x64-based versions of Windows Server 2008 and of Windows Vista

File name

File version

File size

Date

Time

Platform

Ntfs.sys

6.0.6001.22882

1,524,624

18-Mar-2011

18:23

x64

Ntfs.sys

6.0.6002.22616

1,504,656

18-Mar-2011

18:23

x64

For all supported IA-64-based versions of Windows Server 2008

File name

File version

File size

Date

Time

Platform

Ntfs.sys

6.0.6001.22882

3,280,784

18-Mar-2011

18:19

IA-64

Ntfs.sys

6.0.6002.22616

3,284,368

18-Mar-2011

18:19

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 software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

For more information about a similar issue that occurs in Windows Server 2003 SP2, click the following article number to view the article in the Microsoft Knowledge Base:

969352 A long delay occurs when the Ntfs.sys driver tries to mount a large volume on a computer that is running Windows Server 2003 SP2

Additional file information

Additional file information for Windows Vista and for Windows Server 2008

Additional files for all supported x86-based versions of Windows Vista and of Windows Server 2008

File name

Update.mum

File version

Not applicable

File size

3,577

Date (UTC)

18-Mar-2011

Time (UTC)

18:40

Platform

Not applicable

File name

X86_823096f0f68e334906ab10e8687cc299_31bf3856ad364e35_6.0.6001.22882_none_fded961b7ea42418.manifest

File version

Not applicable

File size

692

Date (UTC)

18-Mar-2011

Time (UTC)

18:40

Platform

Not applicable

File name

X86_df64e92869ebc72e2df7d14dacefb97e_31bf3856ad364e35_6.0.6002.22616_none_5ef6f08f89bdccf9.manifest

File version

Not applicable

File size

692

Date (UTC)

18-Mar-2011

Time (UTC)

18:40

Platform

Not applicable

File name

X86_microsoft-windows-ntfs_31bf3856ad364e35_6.0.6001.22882_none_a6a65506364837a4.manifest

File version

Not applicable

File size

16,841

Date (UTC)

18-Mar-2011

Time (UTC)

18:40

Platform

Not applicable

File name

X86_microsoft-windows-ntfs_31bf3856ad364e35_6.0.6002.22616_none_a8dc797033322bb4.manifest

File version

Not applicable

File size

16,841

Date (UTC)

18-Mar-2011

Time (UTC)

18:40

Platform

Not applicable

Additional files for all supported x64-based versions of Windows Vista and of Windows Server 2008

File name

Amd64_2106a452ba4db4aebd2d13ac7ba5d762_31bf3856ad364e35_6.0.6002.22616_none_c2f64ae0f5824b4c.manifest

File version

Not applicable

File size

696

Date (UTC)

18-Mar-2011

Time (UTC)

18:40

Platform

Not applicable

File name

Amd64_c8cf1ae46ba45bed62470fef4bdff0e3_31bf3856ad364e35_6.0.6001.22882_none_c43415b1c8a6d48e.manifest

File version

Not applicable

File size

696

Date (UTC)

18-Mar-2011

Time (UTC)

18:40

Platform

Not applicable

File name

Amd64_microsoft-windows-ntfs_31bf3856ad364e35_6.0.6001.22882_none_02c4f089eea5a8da.manifest

File version

Not applicable

File size

17,104

Date (UTC)

18-Mar-2011

Time (UTC)

18:40

Platform

Not applicable

File name

Amd64_microsoft-windows-ntfs_31bf3856ad364e35_6.0.6002.22616_none_04fb14f3eb8f9cea.manifest

File version

Not applicable

File size

17,104

Date (UTC)

18-Mar-2011

Time (UTC)

18:40

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

3,605

Date (UTC)

18-Mar-2011

Time (UTC)

18:40

Platform

Not applicable

Additional files for all supported IA-64-based versions of Windows Server 2008

File name

Ia64_55a5206aa84bbbc82e864824dcd223ff_31bf3856ad364e35_6.0.6002.22616_none_9ba5150a499d38b6.manifest

File version

Not applicable

File size

694

Date (UTC)

18-Mar-2011

Time (UTC)

18:40

Platform

Not applicable

File name

Ia64_78c8536102f5322b0efa1ac808147e96_31bf3856ad364e35_6.0.6001.22882_none_c7ca1dccc968fc86.manifest

File version

Not applicable

File size

694

Date (UTC)

18-Mar-2011

Time (UTC)

18:40

Platform

Not applicable

File name

Ia64_microsoft-windows-ntfs_31bf3856ad364e35_6.0.6001.22882_none_a6a7f8fc364640a0.manifest

File version

Not applicable

File size

17,096

Date (UTC)

18-Mar-2011

Time (UTC)

18:40

Platform

Not applicable

File name

Ia64_microsoft-windows-ntfs_31bf3856ad364e35_6.0.6002.22616_none_a8de1d66333034b0.manifest

File version

Not applicable

File size

17,096

Date (UTC)

18-Mar-2011

Time (UTC)

18:40

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

2,758

Date (UTC)

18-Mar-2011

Time (UTC)

18:40

Platform

Not applicable

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