Symptoms

Consider the following scenario:

  • You have a large hard disk installed a computer that is running Windows 7.

  • You create many restore points on the computer.

  • You try to start the computer.

In this scenario, the startup process may be very slow.

Cause

This issue occurs because the boot plan for the ReadyBoot feature exceeds the size limit of 512 kilobytes (KB). Each restore point creates a snapshot of Windows that Volsnap.sys must validate during the startup process. When you create many restore points, the boot plan for the ReadyBoot feature eventually exceeds the size limit of 512 KB, and cannot be stored. Therefore, startup I/O operations are not precached, and the startup process is slow.

Note The boot plan is stored in the following registry entry:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\rdyboost\Parameters\BootPlan
Note: There may be additional causes that result in your PC starting up slower than expected that are unrelated to excessive System Restore Points. This issue can also happen if the boot process is loaded with a large amount of items. Example: You have a large amount of startup items, including startup applications running in the background, hardware drivers being loaded, and applications set to start when you start your PC.

To check for the issue with Restore Points, look in the Event viewer for the following Event Log.  

Log Name:       Microsoft-Windows-ReadyBoost/Operational
Source: ReadyBoost
Event ID: 1016
Level: Information
User: System
OpCode: Info
Task Category: ReadyBoot



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.

Prerequisites

To apply this hotfix, you must be running Windows 7 or Windows 7 Service Pack 1 (SP1).

For more information about how to obtain a Windows 7 or Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

976932 Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

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 7 file information notes


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

    Version

    Product

    Milestone

    Service branch

    6.1.760
    0.16xxx

    Windows 7

    RTM

    GDR

    6.1.760
    0.20xxx

    Windows 7

    RTM

    LDR

    6.1.760
    1.17xxx

    Windows 7

    SP1

    GDR

    6.1.760
    1.21xxx

    Windows 7

    SP1

    LDR

  • GDR service branches contain only those fixes that are widely released to address widespread, extremely important issues. LDR service branches contain hotfixes in addition to widely released fixes.

  • 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 7" section. MUM 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 7

File name

File version

File size

Date

Time

Platform

Rdyboost.sys

6.1.7600.16819

173,440

23-May-2011

04:38

x86

Rdyboost.sys

6.1.7600.20971

173,440

23-May-2011

04:40

x86

Rdyboost.sys

6.1.7601.17620

173,440

23-May-2011

04:31

x86

Rdyboost.sys

6.1.7601.21732

173,440

23-May-2011

06:09

x86

Readyboostperfcounters.h

Not applicable

905

10-Jun-2009

21:46

Not applicable

Readyboostperfcounters.ini

Not applicable

4,284

10-Jun-2009

21:46

Not applicable

Sysmain.dll

6.1.7600.16819

1,169,408

23-May-2011

04:38

x86

Systemsf.ebd

Not applicable

152,516

10-Jun-2009

21:46

Not applicable

Readyboostperfcounters.h

Not applicable

905

10-Jun-2009

21:46

Not applicable

Readyboostperfcounters.ini

Not applicable

4,284

10-Jun-2009

21:46

Not applicable

Sysmain.dll

6.1.7600.20971

1,169,408

23-May-2011

04:37

x86

Systemsf.ebd

Not applicable

152,516

10-Jun-2009

21:46

Not applicable

Readyboostperfcounters.h

Not applicable

905

10-Jun-2009

21:46

Not applicable

Readyboostperfcounters.ini

Not applicable

4,284

10-Jun-2009

21:46

Not applicable

Sysmain.dll

6.1.7601.17620

1,159,168

23-May-2011

04:28

x86

Systemsf.ebd

Not applicable

146,852

05-Nov-2010

02:20

Not applicable

Readyboostperfcounters.h

Not applicable

905

10-Jun-2009

21:46

Not applicable

Readyboostperfcounters.ini

Not applicable

4,284

10-Jun-2009

21:46

Not applicable

Sysmain.dll

6.1.7601.21732

1,159,168

23-May-2011

06:09

x86

Systemsf.ebd

Not applicable

146,852

05-Nov-2010

02:20

Not applicable

For all supported x64-based versions of Windows 7

File name

File version

File size

Date

Time

Platform

Rdyboost.sys

6.1.7600.16819

213,888

23-May-2011

05:22

x64

Rdyboost.sys

6.1.7600.20971

213,888

23-May-2011

05:23

x64

Rdyboost.sys

6.1.7601.17620

213,888

23-May-2011

05:32

x64

Rdyboost.sys

6.1.7601.21732

213,888

23-May-2011

05:11

x64

Readyboostperfcounters.h

Not applicable

905

10-Jun-2009

21:08

Not applicable

Readyboostperfcounters.ini

Not applicable

4,284

10-Jun-2009

21:08

Not applicable

Sysmain.dll

6.1.7600.16819

1,780,736

23-May-2011

05:20

x64

Systemsf.ebd

Not applicable

369,720

10-Jun-2009

21:08

Not applicable

Readyboostperfcounters.h

Not applicable

905

10-Jun-2009

21:08

Not applicable

Readyboostperfcounters.ini

Not applicable

4,284

10-Jun-2009

21:08

Not applicable

Sysmain.dll

6.1.7600.20971

1,780,736

23-May-2011

05:24

x64

Systemsf.ebd

Not applicable

369,720

10-Jun-2009

21:08

Not applicable

Readyboostperfcounters.h

Not applicable

905

10-Jun-2009

21:08

Not applicable

Readyboostperfcounters.ini

Not applicable

4,284

10-Jun-2009

21:08

Not applicable

Sysmain.dll

6.1.7601.17620

1,743,360

23-May-2011

05:33

x64

Systemsf.ebd

Not applicable

347,904

05-Nov-2010

02:20

Not applicable

Readyboostperfcounters.h

Not applicable

905

10-Jun-2009

21:08

Not applicable

Readyboostperfcounters.ini

Not applicable

4,284

10-Jun-2009

21:08

Not applicable

Sysmain.dll

6.1.7601.21732

1,743,360

23-May-2011

05:08

x64

Systemsf.ebd

Not applicable

347,904

05-Nov-2010

02:20

Not applicable

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 the ReadyBoot feature, visit the following Microsoft Developer Network (MSDN) website:

A quick start guide to the ReadyBoot featureFor 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

Additional file information

Additional file information for Windows 7

Additional files for all supported x86-based versions of Windows 7

File name

Update.mum

File version

Not applicable

File size

2,341

Date (UTC)

23-May-2011

Time (UTC)

08:49

Platform

Not applicable

File name

X86_04adba183e1f2ed2e2afcf36c3ec1f9d_31bf3856ad364e35_6.1.7601.17620_none_4acc7910ef53ea41.manifest

File version

Not applicable

File size

712

Date (UTC)

23-May-2011

Time (UTC)

08:49

Platform

Not applicable

File name

X86_100db5400d9ac453e1727dfa1b865762_31bf3856ad364e35_6.1.7601.21732_none_8fef5e6fbd48da82.manifest

File version

Not applicable

File size

712

Date (UTC)

23-May-2011

Time (UTC)

08:49

Platform

Not applicable

File name

X86_2883661c2c09f74569f8f6790e5cb1e9_31bf3856ad364e35_6.1.7600.20971_none_59909e9468565c02.manifest

File version

Not applicable

File size

712

Date (UTC)

23-May-2011

Time (UTC)

08:49

Platform

Not applicable

File name

X86_37a85de6cc9012c4f4613b1b473fb646_31bf3856ad364e35_6.1.7600.20971_none_9dde0511ad6422fb.manifest

File version

Not applicable

File size

704

Date (UTC)

23-May-2011

Time (UTC)

08:49

Platform

Not applicable

File name

X86_424a813aa7e8c614140d1dd6e93de378_31bf3856ad364e35_6.1.7600.16819_none_2809f9f4ac184eed.manifest

File version

Not applicable

File size

712

Date (UTC)

23-May-2011

Time (UTC)

08:49

Platform

Not applicable

File name

X86_5dca88406678e5dd03b2a3ea506ca375_31bf3856ad364e35_6.1.7601.17620_none_2d002a6e8e36c44b.manifest

File version

Not applicable

File size

704

Date (UTC)

23-May-2011

Time (UTC)

08:49

Platform

Not applicable

File name

X86_db989c543b60e46772bce473b95fea78_31bf3856ad364e35_6.1.7601.21732_none_59d1fb27745a209a.manifest

File version

Not applicable

File size

704

Date (UTC)

23-May-2011

Time (UTC)

08:49

Platform

Not applicable

File name

X86_f9994332a25bd09c500da93acaeff5bd_31bf3856ad364e35_6.1.7600.16819_none_75b3f35af7c474e0.manifest

File version

Not applicable

File size

704

Date (UTC)

23-May-2011

Time (UTC)

08:49

Platform

Not applicable

File name

X86_microsoft-windows-readyboostdriver_31bf3856ad364e35_6.1.7600.16819_none_14cb16c45614345d.manifest

File version

Not applicable

File size

22,208

Date (UTC)

23-May-2011

Time (UTC)

05:00

Platform

Not applicable

File name

X86_microsoft-windows-readyboostdriver_31bf3856ad364e35_6.1.7600.20971_none_150bd1b76f69b115.manifest

File version

Not applicable

File size

22,208

Date (UTC)

23-May-2011

Time (UTC)

04:57

Platform

Not applicable

File name

X86_microsoft-windows-readyboostdriver_31bf3856ad364e35_6.1.7601.17620_none_169da144534ad82b.manifest

File version

Not applicable

File size

22,208

Date (UTC)

23-May-2011

Time (UTC)

04:48

Platform

Not applicable

File name

X86_microsoft-windows-readyboostdriver_31bf3856ad364e35_6.1.7601.21732_none_171e6eb76c6ec694.manifest

File version

Not applicable

File size

22,208

Date (UTC)

23-May-2011

Time (UTC)

06:30

Platform

Not applicable

File name

X86_microsoft-windows-s..mmaintenanceservice_31bf3856ad364e35_6.1.7600.16819_none_3d740288414e7bd0.manifest

File version

Not applicable

File size

47,856

Date (UTC)

23-May-2011

Time (UTC)

05:07

Platform

Not applicable

File name

X86_microsoft-windows-s..mmaintenanceservice_31bf3856ad364e35_6.1.7600.20971_none_3db4bd7b5aa3f888.manifest

File version

Not applicable

File size

47,856

Date (UTC)

23-May-2011

Time (UTC)

05:04

Platform

Not applicable

File name

X86_microsoft-windows-s..mmaintenanceservice_31bf3856ad364e35_6.1.7601.17620_none_3f468d083e851f9e.manifest

File version

Not applicable

File size

47,856

Date (UTC)

23-May-2011

Time (UTC)

04:52

Platform

Not applicable

File name

X86_microsoft-windows-s..mmaintenanceservice_31bf3856ad364e35_6.1.7601.21732_none_3fc75a7b57a90e07.manifest

File version

Not applicable

File size

47,856

Date (UTC)

23-May-2011

Time (UTC)

06:34

Platform

Not applicable

Additional files for all supported x64-based versions of Windows 7

File name

Amd64_09fe0291e0572a9311e2deb4b662e018_31bf3856ad364e35_6.1.7601.17620_none_1d6b433de0292b4e.manifest

File version

Not applicable

File size

716

Date (UTC)

23-May-2011

Time (UTC)

08:49

Platform

Not applicable

File name

Amd64_356357cfb1e3c1d2c1ddafa43de71281_31bf3856ad364e35_6.1.7600.20971_none_e9a84466ecac1cb0.manifest

File version

Not applicable

File size

708

Date (UTC)

23-May-2011

Time (UTC)

08:49

Platform

Not applicable

File name

Amd64_52405ed64043931ad984e9862a8e4a96_31bf3856ad364e35_6.1.7600.16819_none_233ff0ea1b0c7bc1.manifest

File version

Not applicable

File size

708

Date (UTC)

23-May-2011

Time (UTC)

08:49

Platform

Not applicable

File name

Amd64_6af0d937900b5336b6dbc62f8e277168_31bf3856ad364e35_6.1.7600.20971_none_8e7fca367c54b86d.manifest

File version

Not applicable

File size

716

Date (UTC)

23-May-2011

Time (UTC)

08:49

Platform

Not applicable

File name

Amd64_7a4016db05bc2b0520f36f2d94013944_31bf3856ad364e35_6.1.7600.16819_none_6415869f0c508ca7.manifest

File version

Not applicable

File size

716

Date (UTC)

23-May-2011

Time (UTC)

08:49

Platform

Not applicable

File name

Amd64_9b1c9891e78a325f7ed78ccaf3fcd770_31bf3856ad364e35_6.1.7601.17620_none_2ea8a3e7054587a3.manifest

File version

Not applicable

File size

708

Date (UTC)

23-May-2011

Time (UTC)

08:49

Platform

Not applicable

File name

Amd64_9ce5a95c7b19b09e20e727d8de08146a_31bf3856ad364e35_6.1.7601.21732_none_47130b5d0a2ef57a.manifest

File version

Not applicable

File size

708

Date (UTC)

23-May-2011

Time (UTC)

08:49

Platform

Not applicable

File name

Amd64_fba1b80171f061e06f8908edaf8dd786_31bf3856ad364e35_6.1.7601.21732_none_711862c558bc7fbc.manifest

File version

Not applicable

File size

716

Date (UTC)

23-May-2011

Time (UTC)

08:49

Platform

Not applicable

File name

Amd64_microsoft-windows-readyboostdriver_31bf3856ad364e35_6.1.7600.16819_none_70e9b2480e71a593.manifest

File version

Not applicable

File size

22,212

Date (UTC)

23-May-2011

Time (UTC)

05:55

Platform

Not applicable

File name

Amd64_microsoft-windows-readyboostdriver_31bf3856ad364e35_6.1.7600.20971_none_712a6d3b27c7224b.manifest

File version

Not applicable

File size

22,212

Date (UTC)

23-May-2011

Time (UTC)

05:50

Platform

Not applicable

File name

Amd64_microsoft-windows-readyboostdriver_31bf3856ad364e35_6.1.7601.17620_none_72bc3cc80ba84961.manifest

File version

Not applicable

File size

22,212

Date (UTC)

23-May-2011

Time (UTC)

05:54

Platform

Not applicable

File name

Amd64_microsoft-windows-readyboostdriver_31bf3856ad364e35_6.1.7601.21732_none_733d0a3b24cc37ca.manifest

File version

Not applicable

File size

22,212

Date (UTC)

23-May-2011

Time (UTC)

07:12

Platform

Not applicable

File name

Amd64_microsoft-windows-s..mmaintenanceservice_31bf3856ad364e35_6.1.7600.16819_none_99929e0bf9abed06.manifest

File version

Not applicable

File size

47,860

Date (UTC)

23-May-2011

Time (UTC)

06:03

Platform

Not applicable

File name

Amd64_microsoft-windows-s..mmaintenanceservice_31bf3856ad364e35_6.1.7600.20971_none_99d358ff130169be.manifest

File version

Not applicable

File size

47,860

Date (UTC)

23-May-2011

Time (UTC)

05:55

Platform

Not applicable

File name

Amd64_microsoft-windows-s..mmaintenanceservice_31bf3856ad364e35_6.1.7601.17620_none_9b65288bf6e290d4.manifest

File version

Not applicable

File size

47,860

Date (UTC)

23-May-2011

Time (UTC)

05:57

Platform

Not applicable

File name

Amd64_microsoft-windows-s..mmaintenanceservice_31bf3856ad364e35_6.1.7601.21732_none_9be5f5ff10067f3d.manifest

File version

Not applicable

File size

47,860

Date (UTC)

23-May-2011

Time (UTC)

07:15

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

2,357

Date (UTC)

23-May-2011

Time (UTC)

08:49

Platform

Not applicable

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