Poor Performance Reading Video CD in IDE CD-ROM Drive

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View products that this article applies to.

This article was previously published under Q149564

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SYMPTOMS

Data transfer can occur very slowly when you are reading a video CD in an IDE CD-ROM drive if the following conditions are true:

The IDE CD-ROM drive is configured as the slave device on an IDE channel, with another device (such as a hard disk) configured as the master device on the chain.
You are using protected-mode drivers to access the IDE devices, including the CD-ROM drive.

For example, playing an MPEG file from a video CD can cause the computer to seem to stop responding (hang) due to the very slow rate at which data is being read from the CD.

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There is a problem in the Ios.vxd file that causes excessive seeks on data requests from the CD-ROM drive under these conditions. This results in degradation in the rate of data transfer from the drive.

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RESOLUTION

Microsoft has released an updated version of the Ios.vxd file that corrects this problem. The file is:

   IOS.VXD version 4.00.953 (3/19/96, 68,825 bytes) and later

To install the updated Ios.vxd file, follow these steps:

Download the IOSUPD.EXE file from one of the online services listed below to an empty folder.
In My Computer or Windows Explorer, double-click the IOSUPD.EXE file you downloaded in step 1.
Follow the instructions on your screen.

The following file is available for download from the Microsoft Download Center:

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Download Iosupd.exe now (http://download.microsoft.com/download/win95upg/tool_k/1.0/w95/en-us/iosupd.exe)

For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 (http://support.microsoft.com/kb/119591/EN-US/ ) How to Obtain Microsoft Support Files from Online Services

Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to prevent any unauthorized changes to the file.

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MORE INFORMATION

For information about other issues resolved by this update, please see the following article in the Microsoft Knowledge Base:

149563 (http://support.microsoft.com/kb/149563/EN-US/ ) Fatal Exception 0E in IOS.VXD with SCSI Printer

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APPLIES TO

Microsoft Windows 95

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kbhotfixserver kbqfe kbdownload kbdiskmemory kbfile kbgraphxlinkcritical KB149564

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Retired KB Content Disclaimer

This article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.

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