System Logs DiagnosticMessages
System Logs DiagnosticMessages stores macOS diagnostic log data used by Console and system reporting tools to help troubleshoot errors and device activity.
What is System Logs DiagnosticMessages?
System Logs DiagnosticMessages is a macOS system log folder that stores diagnostic message data used by Apple logging and reporting tools. You may encounter it when browsing system reports in Console, checking storage, or looking through hidden folders during troubleshooting. The data in this location helps record system events, app and service messages, and other diagnostics that can be useful when investigating crashes, performance problems, hardware issues, or unusual behavior. This is operating system data rather than a regular user document folder, so it is tied to macOS logging workflows and support diagnostics. Most people never need to open it directly, but support technicians and advanced users may rely on its contents when reviewing reports or collecting troubleshooting information.
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Safety overview
Status: Use with caution
This folder contains macOS diagnostic logs used for troubleshooting and reporting. Its contents can include detailed system and app activity, so treat it as potentially sensitive if you share files from it. Removing log data may reduce the information available for diagnosing crashes or system problems, and manual changes inside /private/var/log can interfere with normal support workflows.
Recommendation: Leave this folder alone during normal use. If disk space is the only concern, use built-in macOS tools to review storage or restart the Mac so temporary logging can be rotated naturally. Only consider clearing old diagnostic data if you understand the impact and do not need the logs for current troubleshooting.
File path
/private/var/log/DiagnosticMessages
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