This article describes troubleshooting methods that you can
use if information similar to the following examples is recorded in the system
Event ID: 9
The device, \Device\ScsiPort0, did not respond within the timeout period.
Event ID: 11
Description: The driver detected a controller error on Device\ScsiPort0.
The name of the source can be the name of any controller, for
example, Atdisk or ATAPI.
In almost all cases, these messages are posted because of
hardware problems. The source may be the controller or (more probably) a device
that is attached to the controller. The hardware problem can be poor cabling,
incorrect termination or transfer rate settings, slow device relinquishment of
the SCSI bus, a faulty device, or in rare cases, a poorly written device
Locating the Source of the Problem
Here are some troubleshooting tips to help you diagnose and
pinpoint the problem:
- Read the technical manual for the SCSI controller to
determine the termination requirements. Many modern SCSI controllers require
active terminators (at least one of the devices on the bus must provide
termination power). Proper termination involves both a terminator (resistor)
and a device that supplies a signal to the bus for termination power. The
SCSI-2 standard specifies that a controller (initiator) must supply termination
power. Therefore, any controller that claims to be SCSI-2 compatible probably
does supply termination power, but you should check to make sure.
Also, many devices, especially drives, can provide termination power; if a
drive has a jumper labeled Trmpwr, enable the jumper.
- If both internal and external SCSI devices are attached,
make sure that the last device on each SCSI chain is terminated, and make sure
that intermediate devices are not terminated.
- If there is only a single SCSI chain (either all internal
or external), make sure that the last device of the SCSI chain is terminated
and that the SCSI controller itself is terminated. This is usually a BIOS
- Look for loose or poor-quality SCSI cabling. A long chain
of cables with mixed internal and external cabling can degrade the signal. A
SCSI specification that allows for a long distance assumes that the cabling
allows no leakage or interference. The allowable reality is generally a shorter
distance. External cables that are six feet long or longer should be replaced
with three-foot cables.
- Look for removable rotating media such as removable hard drives.
Removable rotating media takes longer to restart than other removal media and may generate an Event ID 11 upon resume from suspend or hibernation. After the device has initialized you can access the device.
- Take note of when the event messages were recorded, and try
to determine whether the messages coincide with certain processing schedules
(such as backups) or heavy disk processing. This might pinpoint the device that
is causing the errors.
The tendency of drives to have these types of
problems under heavy stress is often due to slow microprocessors. In a
multitasking environment, the processor may not be fast enough to process all
the input/output (I/O) commands that arrive almost simultaneously.
- Slow down the transfer rate settings if timeouts are
associated with tape drives; using a 5-mbs transfer rate usually cures the
- Simplify the SCSI/IDE chain by removing devices. If you
suspect that a particular device is causing the problem, move that device to
another controller. If the behavior follows the device, replace the
- Check the revisions of the SCSI controller BIOS and of
device firmware, and obtain the latest revisions from the manufacturer. (There
is a procedure for checking the model number and firmware revision later in
- Check the version of SCSI device driver. The SCSI driver is
located in the %SystemRoot%\System32\Drivers folder. Look at the version in the
properties for the driver file. If the driver is not up-to-date, see whether
the manufacturer has a newer version.
- Remove any other controllers that might create bus
- See whether a low-level format performed by the SCSI
controller resolves the event messages.
- Try substituting a different make or model of any suspect
Checking the Model Number and Firmware Revision of a DeviceImportant
This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
How to back up and restore the registry in Windows
The model number of the device and its firmware
revision are in the Windows registry. To view this information, follow these
- Start Registry Editor (Regedit.exe).
- Locate the following key in the registry
TargetIdx\LogicalUnitIdx where x varies according to the device
- Look at the REG_SZ identifier value to see the model number
and firmware revision values. For example, if you see 0510 is the firmware revision value.
- Record the device model number and firmware revisions, and
check with the manufacturer to see whether there are any known issues for that
model of the device.