Microsoft KB Archive/260091

= Files That You Copy to a Locally Mapped Drive Are Copied Slowly =

Article ID: 260091

Article Last Modified on 2/28/2007

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APPLIES TO


 * Microsoft Windows NT Server 4.0, Terminal Server Edition
 * Microsoft Windows 2000 Service Pack 1
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Service Pack 1
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 4.0 Standard Edition

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This article was previously published under Q260091



SYMPTOMS
When you locally map a drive to a computer by specifying a Universal Naming Convention (UNC), files that you copy are significantly slower than files that you copy directly to a local drive.



CAUSE
This behavior occurs because loop-back UNC connections have overhead that is introduced by RDR, Transmission Control Protocol/Internet Protocol (TCP/IP), SRV, and other drivers, while files that you copy locally are copied directly to the file system.



RESOLUTION
To resolve this behavior, do not copy files to local shares; either use a drive letter and folder or use the subst command so that you can use a drive letter to point to a local folder.



STATUS
This behavior is by design.

Additional query words: performance

Keywords: kbenv kbnetwork kbfile kbprb KB260091

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