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Description
Some versions of Microsoft Windows* 95
may not recognize a non-compliant ATAPI device when configured as
a master and connected alone on the secondary IDE port on Intel motherboards
using the Intel® 82371SB PIIX3 or 82371AB PIIX4 IDE controller. This
can result in the ATAPI device (such as CD-ROMs) not being detected
or being configured improperly.
Root Cause
This problem has been isolated
to CD-ROM drives that do not comply with the ATAPI specification.
These IDE CD-ROMs may use an ATAPI interface chip that floats the
IDE bus in between a "secondary slave identify" command and a subsequent
read of the status register -- and potentially confusing the detection
algorithm used by the Windows* 95 driver.
Although only one ATAPI device is
connected as a master to the secondary IDE channel, Windows 95 detects
another, non-existent device. When other functions try to use this
ghost device, they fail and time out. As a result, the secondary
channel is taken out of service, including the CD-ROM drive that
was properly configured.
Users can detect a potential problem
by using the Windows 95 Device Manager (click Start, Settings,
Control Panel, double click on the System icon, then
click on the Device Manager tab). The CD-ROM entry may potentially
be missing and the secondary IDE controller under the Hard Drive
Controller section will appear to be in conflict with another
device or not working properly. Depending upon the CD-ROM in use,
the drive may potentially be detected by Device Manager or
be seen under My Computer. However, if the Secondary IDE
Controller is shown to be in conflict, the CD-ROM may not work reliably.
Affected Products
This issue potentially affects
all Intel motherboard products with the 82371SB or 82371AB component.
Workaround / Action
As a workaround, Intel recommends
a system configuration consisting of a single IDE hard disk drive
and a single CD-ROM drive as a master and slave respectively on
the primary IDE port. Contact Microsoft or Intel Customer Support
for other workaround options that may be available.
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Updated: Thursday, June 26, 1997
