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FIgURE 30-3 The System Diagnostics report includes detailed information about the computer,
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including possible sources of hardware problems .
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Examine the report to determine whether any of the causes might be related to the problem you are troubleshooting .
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Memory problems are one of the most common types of hardware problem . Memory problems can prevent Windows from starting and cause unpredictable Stop errors when Windows has started . Because memory-related problems can cause intermittent failures, they can be difficult to identify .
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ecause of the massive number of memory chips that hardware manufacturers produce and the high standards customers have for reliability, memory testing
is a highly refined science. Different memory tests are designed to detect specific types of common failures, including the following:
a bit may always return 1, even if set to 0. Similarly, a bit may always return 0, even if set to 1. This is known as a Stuck-at Fault (SaF). The wrong bit is addressed when attempting to read or write a specific bit. This is known as an address Decoder Fault (aF). a section of memory may not allow values to change. This is known as a Transition Fault (TF). a section of memory changes when being read. This is called a Read Disturb Fault (RDF). One or more bits lose their contents after a period of time. This is known as a Retention Fault (RF) and can be one of the more challenging types of failures to detect. a change to one bit affects another bit. This is known as a Coupling Fault (CF) if the faulty bit changes to the same value as the modified bit, an Inversion Coupling Fault (CFin) if the faulty bit changes to the opposite value as the modified bit, or an Idempotent Coupling Fault (CFid) if the faulty bit always becomes a certain value (1 or 0) after any transition in the modified bit. This behavior can also occur because of a short between two cells, known as a Bridging Fault (BF).
Given these types of failures, it s clear that no single test could properly diagnose all the problems. For example, a test that wrote all 1s to memory and then verified that the memory returned all 1s would properly diagnose an SaF fault in which memory is stuck at 0. However, it would fail to diagnose an SaF fault in which memory is stuck at 1, and it would not be complex enough to find many BFs or CFs. Therefore, to properly diagnose all types of memory failures, Windows Memory Diagnostics provides several different types of tests.
Fortunately, Windows includes Windows Memory Diagnostics, an offline diagnostic tool that automatically tests your computer s memory . Windows Memory Diagnostics tests your computer s memory by repeatedly writing values to memory and then reading those values from memory to verify that they have not changed . To identify the widest range of memory failures, Windows Memory Diagnostics includes three different testing levels:
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Basic
Basic tests include:
MATS+ INVC SCHCKR (which enables the cache) LRAND Stride6 (which enables the cache) CHCKR3 WMATS+ WINVC All standard tests, plus: MATS+ (which disables the cache) Stride38 WSCHCKR WStride-6 CHKCKR4 WCHCKR3 ERAND Stride6 (which disables the cache) CHCKR8
Standard All basic tests, plus:
Extended
Although the specifics of each of these tests are not important for administrators to understand, it is important to understand that memory testing is never perfect . Failures are often intermittent and may occur only once every several days or weeks in regular usage . Automated tests such as those done by Windows Memory Diagnostics increase the likelihood that a failure can be detected; however, you can still have faulty memory while Windows Memory Diagnostics indicates that no problems were detected . To minimize this risk, run the Extended tests and increase the number of repetitions . The more tests you run, the more confident you can be in the result . If you have even a single failure, it indicates faulty memory . After Windows Memory Diagnostics completes testing, the computer will automatically restart . Windows will display a notification bubble with the test results, as shown in Figure 30-4, and you can view events in the System Event Log with the source MemoryDiagnosticsResults (Event ID 1201) .
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