Microsoft KB Archive/154435

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Windows 95 IDE Support for SMART, DMA, and ATAPI Tape Drives

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Q154435

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The information in this article applies to:


 * Microsoft Windows 95

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SYMPTOMS
The ATAPI IDE driver in Windows 95 (Esdi_506.pdr) does not include functionality for the following features:


 * SMART support (the ability for certain programs to predict whether a hard disk failure may occur)
 * DMA support for ATAPI devices
 * ATAPI tape drive support

CAUSE
The functionality for these features is not built into the Windows 95 IDE driver. However, Microsoft has released an updated Esdi_506.pdr file that supports these features as follows:


 * SMART provides support for SMART programs, which will be able to predict some hard disk failures. The updated driver itself does not provide this functionality, but provides the support for SMART programs to implement this functionality.
 * DMA (also called bus mastering) reduces CPU overhead by providing a mechanism for data transfers that do not have to be monitored by the CPU. Transfer rate for a particular transfer will not noticeably increase, but the CPU overhead should be significantly reduced in DMA mode. (For example, a 10 percent CPU overhead may be observed for DMA transfers versus a 30 percent CPU overhead for PIO transfers, in typical ATAPI CD-ROM transfers.)
 * ATAPI tape drive support is included in the IDE driver, which will allow a backup program that supports ATAPI tape to be used.

RESOLUTION
A supported fix is now available from Microsoft, but it is only intended to correct the problem described in this article and should be applied only to systems experiencing this specific problem.

To resolve this problem immediately, download the fix as instructed below or contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://support.microsoft.com/directory/overview.asp

NOTE: In special cases, charges that are normally incurred for support calls may be canceled, if a Microsoft Support Professional determines that a specific update will resolve your problem. Normal support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

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

"Download.gifoad Remideup.exe now]" For additional information about how to download Microsoft Support files, click the article number below to view the article in the Microsoft Knowledge Base:

"Q119591 How to Obtain Microsoft Support Files from Online Services" Microsoft used the most current virus detection software available on the date of posting to scan this file for viruses. Once posted, the file is housed on secure servers that prevent any unauthorized changes to the file.

The following files are installed by remideup.exe:

 File name     Version    Date/Time       Size    Destination folder ESDI_506.PDR 4.00.1116  8/25/97 11:16a  24,426  Windows\SYSTEM\IOSUBSYS VOLTRACK.VXD 4.00.954   3/6/96 9:54a    18,518  Windows\SYSTEM\IOSUBSYS NOTE: The Voltrack.vxd file is installed on Windows 95 (not OSR2 or later) only.

This issue is resolved in Microsoft Windows 98.

STATUS
Microsoft has confirmed this to be a problem in the Microsoft products that are listed at the beginning of this article.

MORE INFORMATION
For additional information about issues resolved by updates to this component, please see the following articles in the Microsoft Knowledge Base:

"Q171353 Computer with Ultra DMA IDE Controller May Hang" "Q161642 Auto Insert Notification May Prevent Automatic Suspend" "Q160800 'Fatal Exception Error' with Iomega IDE Zip Drives" "Q154976 Error Message Running Jet Database Engine Stress Test" "Q154436 Errors Accessing Hard Disk with Spin-Down Enabled" "Q153471 Problems with Removable IDE Drives in Windows 95" Additional query words:

Keywords : win95 kbgraphxlinkcritical

Issue type : kbprb

Technology : kbWin95search kbWin95