Verifying the Creation of a Kernel-Mode Dump File
If you have a machine that has broken into the debugger, but you are unsure whether the crash dump file was successfully written, execute the following command:
dd nt!IopFinalCrashDumpStatus L1
This displays the value of the IopFinalCrashDumpStatus variable.
If this value equals zero, the process was successful. If it equals -1 (0xFFFFFFFF), the dump process has not started.
Any other value is a status code indicating an error during the dump process.