Computer Hangs Copying Data from CD-ROM Drive

This article was previously published under Q132882
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When you are copying a large directory structure from a CD-ROM drive toa local hard disk, your computer may stop responding (hang). You mustperform a local reboot to end the copy task and regain control of yourcomputer.
The Windows CD-ROM file system with protected-mode drivers includes a"Read-Ahead" feature that is designed to provide smoother video playback,with faster and more efficient data streaming. The Read-Ahead feature cancause the CD-ROM drive controller to be driven faster than it was designedto be.
To prevent this problem, follow these steps:
  1. Click the Start button, point to Settings, then click Control Panel.
  2. Double-click the System icon.
  3. On the Performance tab, click File System.
  4. Click the CD-ROM tab.
  5. In the Optimize Access Pattern For box, click the setting that matches the CD-ROM drive you are using. Click OK. Restart the computer when you are prompted to.
  6. If steps 1-5 do not solve the problem, repeat steps 1-4. In the Optimize Access Pattern For box, click No Read Ahead. Click OK. Restart the computer when you are prompted to.
The following table describes the Optimize Access Pattern For settings:
   Setting               Behavior   -------------------------------------------   No Read Ahead         Read ahead 0 bytes   Single-speed drives   Read ahead 50K bytes   Double-speed drives   Read ahead 100K bytes   Triple-speed drives   Read ahead 150K bytes   Quad-speed drives     Read ahead 200K bytes				

If you are not sure of your CD-ROM drive's transfer rate, please consultthe drive's documentation or manufacturer.


Article ID: 132882 - Last Review: 12/04/2015 11:40:27 - Revision: 1.3

Microsoft Windows Millennium Edition, Microsoft Windows 98 Second Edition, Microsoft Windows 98 Standard Edition, Microsoft Windows 95

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