Windows xp blue screen of death stop codes

Windows XP Blue Screen of Death STOP Codes
When Windows XP detects a problem from which it cannot recover, it displays Stop messages.
These are text-mode error messages that report information about the condition.
Stop messages, sometimes referred to as blue screens (BSoD), contain specific information that
can help you diagnose and possibly resolve the problem detected by the Windows kernel.
This list describes these messages and helps you understand and interpret them.
This list is NOT exhaustive or meant to resolve EVERY error.
This list of messages is a guide to individual messages and their possible causes and
resolutions... Having a basic understanding of these error messages enables you to
communicate with your technical support professional more effectively too.
With all these Stop messages, you can pretty much assume someone else has encountered the
problem before you. That is why tying in the error message into www.google.com , posting a
notice for help on a relevant newsgroup and entering the stop code into the "Microsoft
Knowledge Base" can yield help just when you need it!
Here is the (long) list:
Stop 0x0000000A or IRQL_NOT_LESS_OR_EQUAL
The Stop 0xA message indicates that a kernel-mode process or driver attempted to access a
memory location to which it did not have permission, or at a kernel interrupt request level
(IRQL) that was too high. A kernel-mode process can access only other processes that have an
IRQL lower than, or equal to, its own. This Stop message is typically due to faulty or
incompatible hardware or software.
Possible Resolutions:
• A Stop 0xA message might occur after installing a faulty device driver, system service, or
firmware. If a Stop message lists a driver by name, disable, remove, or roll back the driver to
correct the problem. If disabling or removing drivers resolves the issues, contact the
manufacturer about a possible update. Using updated software is especially important for
multimedia applications, antivirus scanners, and CD mastering tools.
• A Stop 0xA message might also be due to failing or defective hardware. If a Stop message
points to a category of devices (video or disk adapters, for example), try removing or replacing
the hardware to determine if it is causing the problem.

• If you encounter a Stop 0xA message while upgrading to Windows XPl, the problem might be
due to an incompatible driver, system service, virus scanner, or backup. To avoid problems
while upgrading, simplify your hardware configuration and remove all third-party device drivers
and system services (including virus scanners) prior to running setup. After you have
successfully installed Windows XP, contact the hardware manufacturer to obtain compatible
updates.
Stop 0x0000001E or KMODE_EXCEPTION_NOT_HANDLED
The Stop 0x1E message indicates that the Windows XP kernel detected an illegal or unknown
processor instruction. The problems that cause Stop 0x1E messages share similarities with
those that generate Stop 0xA errors in that they can be due to invalid memory and access
violations. This default Windows XP error handler typically intercepts these problems if error-
handling routines are not present in the code itself.
• Stop 0x1E messages typically occur after installing faulty drivers or system services, or they
can indicate hardware problems, such as memory and IRQ conflicts. If a Stop message lists a
driver by name, disable, remove, or roll it back to correct the problem. If disabling or removing
applications and drivers resolves the issue, contact the hardware manufacturer about a
possible update. Using updated software is especially important for multimedia applications,
antivirus scanners, and CD mastering tools.
• If the Stop message mentions the file Win32k.sys, the source of the error might be a third-
party "remote control" program. If such software is installed, you might be able to disable it by
starting the system in safe mode. If not, use Recovery Console to manually delete the system
service file that is causing the problem.
• Problems can result from system firmware incompatibilities. Many Advanced Configuration
and Power Interface (ACPI) issues can be resolved by updating to the latest firmware.
• Other possible causes include insufficient disk space while installing applications or
performing certain functions that require more memory. You can free up space by deleting
unneeded files. Use Disk Cleanup to increase available disk space. From Recovery Console,
remove temporary files (those with .tmp file extensions), Internet cache files, application
backup files, and .tmp files generated by Chkdsk.exe or Autochk.exe. You can also choose to
install additional applications to another hard disk with more free space or move data files,
paging files, and so on.
• The problem might be due to a memory leak caused by an application or service that is not
releasing memory correctly. Poolmon (Poolmon.exe) helps you to isolate the components that
are causing kernel memory leaks. For more information about troubleshooting memory leaks,

see Microsoft Knowledgebase articles Q177415, "How to Use Poolmon to Troubleshoot Kernel
Mode Memory Leaks," and Q298102, "Finding Pool Tags Used by Third Party Files Without
Using the Debugger."
Stop 0x00000024 or NTFS_FILE_SYSTEM
The Stop 0x24 message indicates that a problem occurred within Ntfs.sys, the driver file that
allows the system to read and write to NTFS file system drives. A similar Stop message, 0x23,
exists for the file allocation table (FAT16 or FAT32) file systems.
• Malfunctioning SCSI and Advanced Technology Attachment (ATA) hardware or drivers can
also adversely affect the system's ability to read and write to disk, causing errors. If using SCSI
hard disks, check for cabling and termination problems between the SCSI controller and the
disks. Periodically check Event Viewer for error messages related to SCSI or FASTFAT in the
System log or Autochk in the Application log.
• Verify that the tools you use to continually monitor your system, such as virus scanners,
backup programs, or disk defragmenters are compatible with Windows XP. Some disks and
adapters come packaged with diagnostic software that you can use to run hardware tests.
To test hard disk or volume integrity
Method 1:
1. In the Run dialog box, in the Open box type:
cmd
2. Start the Chkdsk tool, which detects and attempts to resolve file system structural
corruption. At the command prompt type:
chkdsk drive: /f
Method 2:
1. Double-click My Computer, and then select the hard disk you want to check.
2. On the File menu, click Properties.
3. Click the Tools tab.
4. In the Error-checking box, click Check Now.
5. In Check disk options, select the Scan for and attempt recovery of bad sectors check box. You
can also select the Automatically fix file system errors check box.
If the volume you are checking is in use, a message asks whether you want to delay disk error
checking until the next time you restart your computer. After you restart, disk error checking
runs and the volume chosen is not available to run other tasks during this process. If you cannot

restart the computer due to the error, use safe mode or Recovery Console.
If you are not using the NTFS file system, and the system partition is formatted with the file
allocation table (FAT16 or FAT32) file system, long file name (LFN) information can be lost if
hard disk tools are started from an MS-DOS command prompt. A command prompt appears
when using a startup floppy disk or when using the command prompt startup option on
multiple boot systems that use FAT16 or FAT32 partitions with Microsoft® Windows® 95 OEM
Service Release 2 (OSR2), Microsoft® Windows® 98, or Microsoft® Windows® Millennium
Edition (Me) installed. Do not use tools meant for other operating systems on Windows XP
partitions!
• Nonpaged pool memory might be depleted, which can cause the system to stop. You can
resolve this situation by adding more RAM, which increases the quantity of nonpaged pool
memory available to the kernel.
Stop 0x0000002E or DATA_BUS_ERROR
The Stop 0x2E message indicates a system memory parity error. The cause is typically failed or
defective RAM (including motherboard, Level 2 cache, or video memory), incompatible or
mismatched memory hardware, or when a device driver attempts to access an address in the
0x8xxxxxxx range that does not exist (does not map to a physical address). A Stop 0x2E message
can also indicate hard disk damage caused by viruses or other problems.
• Stop 0x2E is typically due to defective, malfunctioning, or failed memory hardware, such as
memory modules, Level 2 (L2) SRAM cache, or video adapter RAM. If you added new hardware
recently, remove and replace it to determine if it is causing or contributing to the problem. Run
diagnostics software supplied by the system manufacturer to determine if the component has
failed.
• Stop 0x2E messages can also occur after installing faulty drivers or system services. If a file
name is given, you need to disable, remove, or roll back that driver. Disable the service or
application and confirm that this resolves the error. If so, contact the hardware manufacturer
about a possible update. Using updated software is especially important for backup programs,
• Hard disk corruption can also cause this Stop message.
• The problem might also be due to cracks, scratched traces, or defective components on the
motherboard. If all else fails, take the system motherboard to a repair facility for diagnostic
testing.

Stop 0x0000003F or NO_MORE_SYSTEM_PTES
The Stop 0x3F message indicates one or more of the following problems:
• The system Page Table Entries (PTEs) are depleted or fragmented due to the system
performing a large number of input/output (I/O) actions.
• A faulty device driver is not managing memory properly.
• An application, such as a backup program, is improperly allocating large amounts of kernel
memory.
• Stop 0x3F messages can occur after installing faulty drivers or system services. If a file name is
given, you need to disable, remove, or roll back that driver. Disable the service or application
and confirm that this resolves the error. If so, contact the hardware manufacturer about a
possible update. Using updated software is especially important for backup programs,
• The system might not actually be out of PTEs, but a contiguous memory block of sufficient
size is not available to satisfy a driver or application request. Check for the availability of
updated driver or application files and consult the hardware or program documentation for
minimum system requirements.
• Another cause is excessive demands for system PTE by applications. This situation is more
common in server environments. Windows XP Professional provides a registry entry,
SystemPages, that you can use to increase the number of PTEs allocated.
Caution
o Do not edit the registry unless you have no alternative. The registry editor bypasses standard
safeguards, allowing settings that can damage your system, or even require you to reinstall
Windows. If you must edit the registry, back it up first...
To increase the number of PTEs allocated in the registry
1. In the Run dialog box, and in the Open box, type: regedit
2. In the registry editor, navigate to the subkey
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControl
Session ManagerMemory Management.
3. Double-click on PagedPoolSize and SystemPages to view the value for each entry.
4. If PagedPoolSize is not zero, assign a value of 0.

5. If SystemPages is not zero, assign a value of 40000 for systems with 128 MB (or less) of
memory, or 110000 for systems with 128 MB to 256 MB of memory. For systems with more
memory, do not increase the SystemPages value above 110000 without contacting Microsoft
technical support.
6. Click OK, and then close the registry editor.
7. Restart your computer.
Stop 0x00000050 or PAGE_FAULT_IN_NONPAGED_AREA
The Stop 0x50 message indicates that requested data was not in memory. The system
generates an exception error when using a reference to an invalid system memory address.
Defective memory (including main memory, L2 RAM cache, video RAM) or incompatible
software (including remote control and antivirus software) might cause Stop 0x50 messages.
• If you added new hardware recently, remove and replace the hardware to determine if it is
causing or contributing to the problem. Run diagnostics software supplied by the hardware
manufacturer to determine if the component has failed.
• Stop 0x50 messages can also occur after installing faulty drivers or system services. If the file
name is listed, you need to disable, remove, or roll back that driver. If not, disable the recently
installed service or application to determine if this resolves the error. If this does not resolve
the problem, contact the hardware manufacturer for updates. Using updated drivers and
software is especially important for network interface cards, video adapters, backup programs,
multimedia applications, antivirus scanners, and CD mastering tools. If an updated driver is not
available, attempt to use a driver from a similar device in the same family. For example, if
printing to a Model 1100C printer causes Stop 0x50 errors, using a printer driver meant for a
Model 1100A or Model 1000 might temporarily resolve the problem.
Stop 0x00000077 or KERNEL_STACK_INPAGE_ERROR
The Stop 0x77 message indicates that a page of kernel data requested from the paging (virtual
memory) file could not be found or read into memory. This Stop message can also indicate disk
hardware failure, disk data corruption, or possible virus infection.
• Stop 0x77 messages can be caused by bad sectors in the virtual memory paging file or a disk
controller error. In extremely rare cases, depleted nonpaged pool resources can cause this
error. If the first and third parameters are zero, the stack signature in the kernel stack is

missing, which is an error typically caused by defective hardware. If the I/O status is
0xC0000185 and the paging file is on a SCSI disk, check for cabling and termination issues. An
I/O status code of 0xC000009C or 0xC000016A indicates that the requested data could not be
found. You can try to correct this by restarting the computer. If a problem with disk integrity
exists, Autochk, a program that attempts to mark bad disk sectors as defective so that they are
not used in the future, starts automatically. If Autochk fails to run, you can manually perform
the integrity check yourself by following the instructions to run Chkdsk provided in "Stop
0x00000024 or NTFS_FILE_SYSTEM" earlier in this list.
• Another cause of Stop 0x77 messages is defective, malfunctioning, or failed memory
hardware, such as memory modules, Level 2 (L2) SRAM cache, or video adapter RAM. If you
added new hardware recently, remove and replace it to determine if it is causing or
contributing to the problem. Run diagnostics software supplied by the system manufacturer to
determine if the component has failed.
testing.
• Problems that cause Stop 0x77 messages can also cause Stop 0x7A messages. For more
information about Stop 0x7A messages, see "Stop 0x0000007A or
KERNEL_DATA_INPAGE_ERROR" later in this list.
Stop 0x00000079 or MISMATCHED_HAL
The Stop 0x79 message indicates that the hardware abstraction layer (HAL) and the kernel type
for the computer do not match. This error most often occurs when ACPI firmware settings are
changed. For example, you might install Windows XP on an x86-based computer with the
firmware ACPI enable option enabled and later decide to disable it. This error can also result
when mismatched single and multi-processor configuration files are copied to the system.
• A Stop 0x79 message occurs when the system is using out-of-date Ntoskrnl.exe or Hal.dll files.
This can occur after manual repairs that involve copying incorrect files to the system. This error
also occurs when using mismatched files, such as copying a multiprocessor HAL on to a system
using a single-processor kernel (or vice versa). The kernel and HAL files for single-processor and
multiprocessor systems are stored on the Windows XP Professional operating system CD using
two different file names. For example, the single and multi-processor versions of the kernel,
named Ntoskrnl.exe and Ntkrnlmp.exe respectively. Setup copies either Ntoskrnl.exe or
Ntkrnlmp.exe to your system as Ntoskrnl.exe. In Recovery Console, you can use the Copy
command to copy the correct HAL or kernel files from the CD to the appropriate folder on the
hard disk.

• If you experience Stop 0x79 messages after changing firmware settings, restore the original
settings used during Windows XP Professional Setup.
Because systems that use the ACPI HAL ignore IRQ assignments stored in firmware, you can
only manually change IRQ settings for non-ACPI (Standard PC HAL) systems. Some x86-based
provide the option to toggle ACPI functionality. To disable or re-enable ACPI, you must change
firmware settings and reinstall Windows XP. Because of the numerous registry and system file
changes required, you must run Setup again (an upgrade installation does not work).
Stop 0x0000007A or KERNEL_DATA_INPAGE_ERROR
The Stop 0x7A message indicates that a page of kernel data was not found in the paging (virtual
memory) file and could not be read into memory. This might be due to incompatible disk or
controller drivers, firmware, or hardware.
Frequently, the cause of this error can be determined from the second parameter, the I/O
status code. Some common status codes are:
• 0xC000009A, or STATUS_INSUFFICIENT_RESOURCES, indicates a lack of nonpaged pool
resources.
• 0xC000009C, or STATUS_DEVICE_DATA_ERROR, indicates bad blocks (sectors) on the hard
disk.
• 0xC000009D, or STATUS_DEVICE_NOT_CONNECTED, indicates defective or loose data or
power cables, a problem with SCSI termination, or improper controller or disk configuration.
• 0xC000016A, or STATUS_DISK_OPERATION_FAILED, indicates bad blocks (sectors) on the hard
disk.
• 0xC0000185, or STATUS_IO_DEVICE_ERROR, indicates improper termination, defective
storage controller hardware, or defective disk cabling, or two devices attempting to use the
same resources.
• Stop 0x7A can be caused by bad sectors in the virtual memory paging file, disk controller
error, virus infection, or memory hardware problems. In extremely rare cases, depleted
nonpaged pool resources can cause this error. If the first and third parameters are zero, the
stack signature in the kernel stack is missing, an error typically caused by defective hardware. If
the I/O status is 0xC0000185 and the paging file is on a SCSI disk, check for cabling and
termination issues. An I/O status code of 0xC000009C or 0xC000016A indicates that the
requested data could not be found. You can try to correct this by restarting the computer. If a
problem with disk integrity exists, Autochk, a program that attempts to mark bad disk sectors

as defective so that they are not used in the future, starts automatically. If Autochk fails to run,
you can manually perform the integrity check yourself by following the instructions to run
Chkdsk provided in "Stop 0x00000024 or NTFS_FILE_SYSTEM" earlier in this appendix.
• Another cause of Stop 0x7A messages is defective, malfunctioning, or failed memory
hardware, such as memory modules, Level 2 (L2) SRAM cache, or video adapter RAM. If you
added new hardware recently, remove and replace it to determine if it is causing or
contributing to the problem. Run diagnostics software supplied by the system manufacturer to
determine if the component has failed.
• Check the hardware manufacturer's Web site for updates to disk adapter firmware or drivers
that improve compatibility. Verify that your disks and controller support the same set of
advanced features, such as higher transfer rates. If necessary, select a slower transfer rate if an
update is not yet available. Consult your hardware or device documentation for more
information.
IMPORTANT
o You can install disk controller drivers not present on the Windows XP Professional operating
system CD by responding to the following prompt shortly after starting Setup:
o Press F6 if you need to install a third party SCSI or RAID driver.
o Press F6, and when prompted, provide the appropriate storage controller driver (ATA or SCSI)
supplied by the manufacturer.
testing.
• Problems that cause Stop 0x7A messages can also cause Stop 0x77 messages. For more
information about Stop 0x77 messages, see "Stop 0x00000077 or
KERNEL_STACK_INPAGE_ERROR" earlier in this list.
Stop 0x0000007B or INACCESSIBLE_BOOT_DEVICE
The Stop 0x7B message indicates that Windows XP has lost access to the system partition or
boot volume during the startup process. Installing incorrect device drivers when installing or
upgrading storage adapter hardware typically causes stop 0x7B errors. Stop 0x7B errors could
also indicate possible virus infection.
The second parameter is very important because it can indicate whether the 0x7B Stop
message was caused by file system issues or problems with storage hardware and drivers.
Values of 0xC000034 or 0xC000000E typically indicate:

• Disks or storage controllers that are failing, defective, or improperly configured.
• Storage-related drivers or programs (tape management software, for example) that are not
fully compatible with Windows XP Professional.
• During I/O system initialization, the controller or driver for the startup device (typically the
hard disk) might have failed to initialize the necessary hardware. File system initialization might
have failed because of disk or controller failure, or because the file system did not recognize the
data on the boot device.
• Repartitioning disks, adding new disks, or upgrading to a new disk controller might cause the
information in the Boot.ini file, or Boot Manager, to become outdated. If this Stop message
occurs after installing new disks to your system, edit the Boot.ini file or adjust the Boot
Manager parameters to allow the system to start. If the error occurs after upgrading the disk
controller, verify that the new hardware is functioning and correctly configured.
• Verify that the system firmware and disk controller BIOS settings are correct and that the
storage device was properly installed. If you are unsure, consult your computer's
documentation about restoring default firmware settings or configuring your system to auto-
detect settings. If the error occurs during Windows XP Professional setup, the problem might be
due to unsupported disk controller hardware. In some cases, drivers for new hardware are not
in the Windows XP Professional Driver.cab library, and you need to provide additional drivers to
complete the Windows XP setup successfully. If this is the case, follow the hardware
manufacturer's instructions when installing drivers. Periodically check for driver and firmware
updates.
• Hard disk corruption can also cause this Stop message. For more information about checking
hard disk integrity, see the instructions provided in "Stop 0x00000024 or NTFS_FILE_SYSTEM"
earlier in this list.
• Problems that cause 0x7B errors might also cause Stop 0xED errors. For more information
about 0xED Stop messages, see "Stop 0x0000007B or INACCESSIBLE_BOOT_DEVICE" later in this
list.
Stop 0x0000007F or UNEXPECTED_KERNEL_MODE_TRAP
The Stop 0x7F message indicates that one of three types of problems occurred in kernel-mode:
• A condition that the kernel is not allowed to have or intercept (also known as a bound trap).
• Software problems.

• Hardware failures.
• Stop 0x7F messages are typically due to defective, malfunctioning, or failed memory
hardware. If you added new hardware recently, remove and replace it to determine if it is
causing or contributing to the problem. Run diagnostics software supplied by the system
manufacturer to determine if the component has failed.
• Running the CPU beyond the rated specification, known as "overclocking," can cause Stop
0x7F or other error messages due to heat buildup. When diagnosing problems on overclocked
systems, first restore all clock and bus speed settings to the manufacturer recommended values
to determine if this resolves the issues.
testing.
• Stop 0x7F messages can occur after installing incompatible applications, drivers, or system
services. Contact the software manufacturer about possible Windows XP specific updates.
Using updated software is especially important for backup programs, multimedia applications,
antivirus scanners, and CD mastering tools.
Stop 0x0000009F or DRIVER_POWER_STATE_FAILURE
The Stop 0x9F message indicates that a driver is in an inconsistent or invalid power state.
• Stop 0x9F messages can occur after installing faulty applications or drivers or system services.
If a file is listed by name and you can associate it with an application, uninstall the application.
For drivers, disable, remove, or roll back that driver to to determine if this resolves the error. If
it does, contact the hardware manufacturer for a possible update. Using updated software is
especially important for backup programs, multimedia applications, antivirus scanners, and CD
mastering tools.
• For information about troubleshooting standby and hibernate mode issues, see KB article
Q266169, "How to Troubleshoot Problems with Standby Mode, Hibernate Mode, and Shutting
Down Your Computer in Windows 2000."
Stop 0xBE or ATTEMPTED_WRITE_TO_READONLY_MEMORY
The Stop 0xBE message indicates that a driver attempted to write to read-only memory.

• A Stop 0xBE message might occur after installing a faulty device driver, system service, or
multimedia applications, antivirus scanners, DVD playback, and CD mastering tools.
Stop 0xC2 or BAD_POOL_CALLER
The Stop 0xC2 message indicates that a kernel-mode process or driver incorrectly attempted to
perform memory operations in the following ways:
• By allocating a memory pool size of zero bytes.
• By allocating a memory pool that does not exist.
• By attempting to free a memory pool that is already free.
• By allocating or freeing a memory pool at an IRQL that was too high.
This Stop message is typically due to a faulty driver or software.
• A Stop 0xC2 messages might occur after installing a faulty device driver, system service, or
multimedia applications, antivirus scanners, DVD playback, and CD mastering tools.
• A Stop 0xC2 messages might also be due to failing or defective hardware. If a Stop message
points to a category of devices (such as disk controllers, for example), try removing or replacing
the hardware to determine if it is causing the problem.
• If you encounter a Stop 0xC2 message while upgrading to Windows XP, the problem might be
due to an incompatible driver, system service, virus scanner, or backup. To avoid problems
while upgrading, simplify your hardware configuration and remove all third-party device drivers
and system services (including virus scanners) prior to running setup. After you have
successfully installed Windows XP, contact the hardware manufacturer to obtain compatible
updates.
Stop 0x000000CE or DRIVER_UNLOADED_WITHOUT
_CANCELLING_PENDING_OPERATIONS

This Stop messages indicates that a driver failed to cancel pending operations before exiting.
• Stop 0xCE messages can occur after installing faulty drivers or system services. If a driver is
listed by name, disable, remove, or roll back that driver to confirm that this resolves the error. If
so, contact the manufacturer about a possible update. Using updated software is especially
important for backup programs, multimedia applications, antivirus scanners, DVD playback, and
CD mastering tools.
Stop 0x000000D1 or DRIVER_IRQL_NOT_LESS_OR_EQUAL
The Stop 0xD1 messages indicates that the system attempted to access pageable memory using
a kernel process IRQL that was too high. Drivers that have used improper addresses typically
cause this error.
• Stop 0xD1 messages can occur after installing faulty drivers or system services. If a driver is
listed by name, disable, remove, or roll back that driver to confirm that this resolves the error. If
so, contact the manufacturer about a possible update. Using updated software is especially
important for backup programs, multimedia applications, antivirus scanners, DVD playback, and
CD mastering tools.
Stop 0x000000EA or THREAD_STUCK_IN_DEVICE_DRIVER
A device driver problem is causing the system to pause indefinitely. Typically, this problem is
caused by a display driver waiting for the video hardware to enter an idle state. This might
indicate a hardware problem with the video adapter or a faulty video driver.
• Stop 0xD1 messages can occur after installing faulty drivers (especially video drivers) or
system services. If a driver is listed by name, disable, remove, or roll back that driver to confirm
that this resolves the error. If so, contact the manufacturer about a possible update. Using
updated software is especially important for backup programs, multimedia applications,
antivirus scanners, DVD playback, and CD mastering tools.
Stop 0x000000ED or UNMOUNTABLE_BOOT_VOLUME
The kernel mode I/O subsystem attempted to mount the boot volume and it failed. This error
might also occur during an upgrade to Windows XP Professional on systems that use higher
throughput ATA disks or controllers with incorrect cabling. In some cases, your system might

appear to work normally after you restart.
• If using higher throughput ATA disks and controllers, those capable of data transfer rates
above 33.3 megabytes per second, replace the standard 40-pin cable with an 80-pin cable.
Using an 80-pin cable is optional for transfer rates up to and including 33.3 megabytes per
second, but is mandatory for higher transfer rates. The additional grounded pins are required to
avoid data loss.
• Some firmware enables you to force higher transfer rates even when you are using the
incorrect cable type. Your firmware might issue a warning but allow the startup process to
proceed. Restore the default firmware setting for ATA cable detection.
• Problems that cause 0xED errors might also cause Stop 0x7B errors. For more information
about 0x7B Stop messages, see "Stop 0x0000007B or INACCESSIBLE_BOOT_DEVICE" earlier in
this appendix.
Stop 0xC0000221 or STATUS_IMAGE_CHECKSUM_MISMATCH
This Stop message indicates driver, system file, or disk corruption problems (such as a damaged
paging file). Faulty memory hardware can also cause this Stop message to appear.
• You can use Driver Rollback or System Restore from safe mode, to restore a previous driver.
You can also use Windows XP Professional recovery features such as the Last Known Good
Configuration startup option, Backup, or Automated System Recovery to restore a previous
working configuration. After restoring from backup media, you might need to reapply service
packs or hotfixes, depending on when the backups were made.
• If the Stop message names the specific file, try replacing it manually with a fresh copy from
the Windows XP Professional operating system CD using safe mode or Recovery Console. For
systems using the FAT16 or FAT32 file system, you have the option of using a Windows 98 or
Windows Millennium Edition Emergency Boot Disk to access the hard disk.
If the original file from the operating system CD has a file name that ends with an underscore
(_) character, you cannot use the file until it is uncompressed. The Recovery Console's Copy
command is ideal for copying compressed files because it detects and expands them. If you do
not specify a destination file name, you must rename the expanded file with the correct
extension before using it. From safe mode or Recovery Console, you can use the Expand
command to uncompress and copy a file to a destination location. In Recovery Console, the
expanded file is given the correct name after being copied to the destination location. For more
information about the Copy or Expand commands, see Windows XP Help and Support Centre.

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