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Bug Check 0x8B: MBR_CHECKSUM_MISMATCH

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The MBR_CHECKSUM_MISMATCH bug check has a value of 0x0000008B. This bug check indicates that a mismatch has occurred in the MBR checksum.

Important

This article is for programmers. If you're a customer who has received a blue screen error code while using your computer, see Troubleshoot blue screen errors.

MBR_CHECKSUM_MISMATCH Parameters

Parameter Description

1

The disk signature from MBR

2

The MBR checksum that the OS Loader calculates

3

The MBR checksum that the system calculates

4

Reserved

Cause

The MBR_CHECKSUM_MISMATCH bug check occurs during the boot process when the MBR checksum that the Microsoft Windows operating system calculates does not match the checksum that the loader passes in.

This error typically indicates a virus.

Resolution

There are many forms of viruses and not all can be detected. Typically, the newer viruses usually can be detected only by a virus scanner that has recently been upgraded. You should boot with a write-protected disk that contains a virus scanner and try to clean out the infection.