Repair Windows Error 0x00000040    |    STOP 0x00000040    |    TARGET_MDL_TOO_SMALL


STOP 0x00000040 : TARGET_MDL_TOO_SMALL

STOP Errors are usually the result of a hardware malfunction or device driver issue. It is also possible to receive a Blue Screen Error due to bad system memory, malfunctioning power supply, components overheating, or hardware overclocked beyond its specification. In older versions of the Windows OS you may also receive Blue Screen Errors due to incompatible DLL files.

Since the only option when receiving a Blue Screen Error is to reboot, any unsaved data is lost. With that in mind, it is very important to eliminate these errors to protect your data.

Basic Troubleshooting

Troubleshooting STOP Errors can be a difficult and time consuming process. Try these basic steps to fix your own Blue Scree Error. We hope it will help you avoid an expensive service call and provide a rewarding experience of solving the problem on your own.

Advanced Troubleshooting

The following details are for advanced users. These are provided for your convenience and may help those with advanced knowledge discover the root cause of their STOP Error.


Stop 0x40: TARGET_MDL_TOO_SMALL

The TARGET_MDL_TOO_SMALL stop error code has a value of 0x00000040. This indicates that a driver has improperly used IoBuildPartialMdl.

Parameters

None

Cause

This is a driver bug. A driver has called the IoBuildPartialMdl function and passed it an MDL to map part of a source MDL, but the target MDL is not large enough to map the entire range of addresses requested.

Resolving the Problem

The source and target MDLs, as well as the address range length to be mapped, are the first, second, and fourth arguments to the IoBuildPartialMdl function. Therefore, doing a stack trace on this particular function might help during the debugging process. Ensure that your code is correctly calculating the necessary size for the target MDL for the address range length that you are passing to this function.

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STOP 0x00000040    |    TARGET_MDL_TOO_SMALL    |    Repair Windows Error 0x00000040