Poor Performance Reading Video CD in IDE CD-ROM Drive

 Last reviewed: March 17, 1998
Article ID: Q149564
95 WINDOWS kbfile kbmm kbhw

The information in this article applies to:

  • Microsoft Windows 95

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.

CAUSE

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.

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:

  1. Download the IOSUPD.EXE file from one of the online services listed below to an empty folder.

  2. In My Computer or Windows Explorer, double-click the IOSUPD.EXE file you downloaded in step 1.

  3. Follow the instructions on your screen. 

    You can find IOSUPD.EXE (size: 174672 bytes) 
                       , a self-extracting file, on the following services:
  4. Microsoft's World Wide Web Site on the Internet 

          On the www.microsoft.com home page, click the Support icon.
      Click Knowledge Base, and select Windows 95 as the product.

          Enter kbfile IOSUPD.EXE (size: 174672 bytes) 
                             , and click GO!
      Open the article, and click the button to download the file.


  5. Internet (anonymous FTP)

          ftp ftp.microsoft.com
      Change to the Softlib/Mslfiles folder.
      Get IOSUPD.EXE (size: 174672 bytes) 

    

  6. Microsoft Download Service (MSDL)

          Dial (425) 936-6735 to connect to MSDL
      Download IOSUPD.EXE (size: 174672 bytes) 

    
For additional information about downloading, please see the following
article in the Microsoft Knowledge Base:

    

       ARTICLE-ID: Q119591
   TITLE     : How to Obtain Microsoft Support Files from Online
               Services


MORE INFORMATION

 


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



   ARTICLE-ID: Q149563
   TITLE     : Fatal Exception 0E in IOS.VXD with SCSI Printer



	
			
	















	






KBCategory: kbfile kbmm kbhw

KBSubcategory: win95 diskmem

Additional reference words: 95

Keywords          : diskmem win95 kbfile kbhw kbmm

Version           : 95

Platform          : WINDOWS








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	Last reviewed:  March 17, 1998
	

	© 1998 Microsoft Corporation. All rights reserved. Terms of Use.