Select the product you need help with
- Internet Explorer
- Windows Phone
- More products
When you copy large files to or from earlier operating systems, the copy operation may be slower than expected on some Windows Vista-based computers
Article ID: 932170 - View products that this article applies to.
Consider the following scenario:
To resolve this problem, obtain the latest service pack for Windows Vista. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/935791/ )How to obtain the latest Windows Vista service pack
To work around this problem, you may be able to use one of the following methods to improve the speed of large file transfers:
Method 1: Disable the Windows Explorer Navigation PaneTo disable the Windows Explorer Navigation Pane, follow these steps:
Method 2: Map a network driveMap a network drive to the folder that contains the files that you want to copy. To do this, use one of the following methods:
Method A: Use the Windows user interface
Method B: Start a command prompt, and then map the drive by using net use command
Method 3: Use RobocopyUse the Robocopy utility that is included with Windows Vista to copy the files. For example, type the following command at a command prompt, and then press ENTER:
Robocopy source_path destination_path file_nameFor more information about how to use Robocopy, type Robocopy /? at a command prompt, and then press ENTER.
Method 4: Disable the automatic adjustment for the TCP window size on the network
Method ATo have us disable auto-tuning for you, go to the "Fix it for me" section. If you would rather disable auto-tuning yourself, go to the "Let me fix it myself" section.
Fix it for meTo disable auto-tuning automatically, click the Fix this problem link. Then click Run in the File Download dialog box, and follow the steps in this wizard.
Fix this problem
Microsoft Fix it 50056
Note this wizard may be in English only; however, the automatic fix also works for other language versions of Windows.
Note If you are not on the computer that has the problem, you can save the automatic fix to a flash drive or to a CD, and then you can run it on the computer that has the problem.
We would appreciate your feedback. To provide feedback or to report any issues with this solution, please leave a comment on the "Fix it for me" blog
(http://blogs.technet.com/fixit4me/), or send us an e-mail
(mailto:email@example.com?Subject=KB932170 - Disable TCP auto-tuning)message.
Let me fix it myself
Method BEnable the "offload checksum" function of the network adapter. For information about how to do this, contact the manufacturer of the network adapter. For information about how to contact the manufacturer of the network adapter, visit the following Microsoft Web site:
http://support.microsoft.com/gp/vendorsMicrosoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.
For more information about the meaning of the offload checksum, visit the following Microsoft Web site:
Check whether the problem is fixed. If the problem is fixed, you are finished with this article. If the problem is not fixed, you can contact support
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was corrected in Windows Vista Service Pack 1.
Article ID: 932170 - Last Review: July 8, 2009 - Revision: 4.1