Microsoft KB Archive/929191

= IBM and Lenovo computers may take longer to start Windows Vista than computers from other manufacturers =

Article ID: 929191

Article Last Modified on 12/20/2006

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APPLIES TO


 * Windows Vista Enterprise 64-bit edition
 * Windows Vista Home Basic 64-bit edition
 * Windows Vista Home Premium 64-bit edition
 * Windows Vista Ultimate 64-bit edition
 * Windows Vista Business
 * Windows Vista Business 64-bit EN
 * Windows Vista Enterprise
 * Windows Vista Home Basic
 * Windows Vista Home Premium
 * Windows Vista Starter
 * Windows Vista Ultimate

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SYMPTOMS
A Windows Vista-based computer that is manufactured by IBM or by Lenovo may take 10 to 20 seconds longer to start than a similar Windows Vista-based computer that is from another manufacturer.



CAUSE
This problem occurs because certain optimizations that speed up disk enumeration in Windows Vista have been disabled for IBM and Lenovo computers. This was done for compatibility reasons. These optimizations cannot be used with the hot swappable Ultrabay drive bay that is used in IBM and Lenovo computers. Therefore, the release version of Windows Vista starts more slowly on all IBM and Lenovo computers.



RESOLUTION
To resolve this problem on IBM or Lenovo computers that do not use a hot swappable Ultrabay drive bay, install this hotfix. This hotfix updates Windows Vista so that the slower startup times apply only to IBM and Lenovo computers that use a hot swappable Ultrabay drive bay, and not to all IBM and Lenovo computers.

Note This hotfix will not reduce startup time for a Windows Vista-based on IBM or Lenovo computers that do not use a hot swappable Ultrabay drive bay.

Hotfix information
A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Windows Vista service pack that contains this hotfix.

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

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.

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, x64-based version


STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
For more information about how hotfix packages are named, click the following article number to view the article in the Microsoft Knowledge Base:

816915 New file naming schema for Microsoft Windows software update packages

For more information, 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

Technical support for x64-based versions of Microsoft Windows
If your hardware came with a Microsoft Windows x64 edition already installed, your hardware manufacturer provides technical support and assistance for the Windows x64 edition. In this case, your hardware manufacturer provides support because a Windows x64 edition was included with your hardware. Your hardware manufacturer might have customized the Windows x64 edition installation by using unique components. Unique components might include specific device drivers or might include optional settings to maximize the performance of the hardware. Microsoft will provide reasonable-effort assistance if you need technical help with a Windows x64 edition. However, you might have to contact your manufacturer directly. Your manufacturer is best qualified to support the software that your manufacturer installed on the hardware. If you purchased a Windows x64 edition such as a Microsoft Windows Server 2003 x64 edition separately, contact Microsoft for technical support.

For product information about Microsoft Windows XP Professional x64 Edition, visit the following Microsoft Web site:

http://www.microsoft.com/windowsxp/64bit/default.mspx

For product information about x64-based versions of Microsoft Windows Server 2003, visit the following Microsoft Web site:

http://www.microsoft.com/windowsserver2003/64bit/x64/default.mspx

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

Additional query words: Winx64 Windowsx64 64bit 64-bit

Keywords: kbfix kbqfe kbprb kbexpertiseinter kbhotfixserver KB929191

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