What is the limitation of the PMD:
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. Loaded programs are not decoded on the device board.
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Hard disk information and statistics are not decoded on the device board.
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Trace & Error section is not always decoded on the device board.
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CPU load is not decoded on the device board.
A PMD contains a vast amount of system state information, but it has limitations in what can be decoded and analyzed. Specifically, hard disk information and statistics are not decoded on the device board when the PMD is processed - this data remains in raw or encoded form. Other limitations exist, but the option correctly identifies hard disk information as a key limitation of PMD decoding.
The PMD (a device-level diagnostic/monitoring board) is limited in that hard disk information and statistics are not decoded on the device board itself — that data has to be retrieved another way (e.g., through the OS or a separate utility), unlike loaded-program info, trace/error data, and CPU load, which the PMD does decode directly. The other three options describe things the PMD board can decode, so they don't represent a 'limitation.' This is vendor-specific hardware documentation trivia rather than general computing knowledge.