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Event ID: 508 Source: ESENT

<process> (<PID>) First Storage Group: A request to write to the file <file> at offset <offset> for <value> bytes succeeded but took an abnormally long time (<value> seconds) to be serviced by the OS. This problem is likely due to faulty hardware. Please contact your hardware vendor for further assistance diagnosing the problem.
If the event is just one odd occurrence, then it may be just a transient problem. If it happens on regular basis then the specified drive should be checked for problems (run chkdsk, make sure you have enough free space and physical memory - running low on memory may affect all the disk operations).
See the comments for "Event ID 508 from source ESE".

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