Computer Hangs Copying Data from CD-ROM Drive

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This article was previously published under Q132882

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SYMPTOMS

When you are copying a large directory structure from a CD-ROM drive to a local hard disk, your computer may stop responding (hang). You must perform a local reboot to end the copy task and regain control of your computer.

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CAUSE

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 can cause the CD-ROM drive controller to be driven faster than it was designed to be.

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RESOLUTION

To prevent this problem, follow these steps:

Click the Start button, point to Settings, then click Control Panel.
Double-click the System icon.
On the Performance tab, click File System.
Click the CD-ROM tab.
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.
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.

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MORE INFORMATION

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 consult the drive's documentation or manufacturer.

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