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CDFS_FILE_SYSTEM
CDFS_FILE_SYSTEM is tied to the CD file-system path. Microsoft documents a useful conditional meaning for parameters 2 and 3: when CdExceptionFilter is on the stack, they point to the exception record and context record. That makes this code much more specific than a generic recommendation to check every disk.
Use the context when it is available
When the stack contains CdExceptionFilter, load the context from parameter 3 with .cxr and then inspect the stack. Parameter 2 preserves the exception record. These values can identify the faulting instruction and exception state that preceded the CDFS stop.
Separate media and memory paths
Microsoft lists file-system or sector corruption, storage-driver problems, and nonpaged-pool depletion as possible causes. Check the actual dump path first: an exception in CDFS while reading optical media is a different investigation from a system already showing severe nonpaged-pool pressure.
References
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