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FANUC Controller
Communication · Basic · 10-20 minutes
Fanuc Alarm IO0004 - Storage Media Full
The Fanuc Alarm IO0004 - Media Full typically occurs when the storage media on the CNC machine lacks sufficient free space to complete an operation. The most common cause is the media being full due to excessive programs or files, and the most likely fix is to delete unnecessary files or transfer them to an external device.
Fanuc Alarm IO0004 - Storage Media Full
Media Full
Fanuc IO0004: The external I/O device storage is full. There is no available space on the connected media to save the program or data being written.
Root Cause Summary
The Fanuc Alarm IO0004 - Media Full typically occurs when the storage media on the CNC machine lacks sufficient free space to complete an operation. The most common cause is the media being full due to excessive programs or files, and the most likely fix is to delete unnecessary files or transfer them to an external device.
Safety
Causes and Fixes
Access File Management Menu
Navigate to the file management or storage menu on the Fanuc control panel. Look for a display of total capacity and used space to confirm if the media is at or near 100% capacity.
Take a screenshot or note the current storage usage for future reference.
Do not delete files without confirming their purpose.
Identify Unnecessary Files
Review the list of programs, backups, and temporary files. Look for old or unused NC programs, test files, or duplicates that can be safely removed.
Sort files by date to quickly identify older, potentially obsolete data.
Ensure you have backups of critical programs before deletion.
Delete or Transfer Files
Select and delete unnecessary files directly from the control panel, or transfer them to an external USB drive or PC via the data transfer function if archiving is needed.
Use a high-speed USB drive for faster transfers if archiving multiple files.
Double-check file selection to avoid accidental deletion of active programs.
Call a technician if:
Prevention
Common Mistakes
Seeing Multiple Alarms?
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Always verify with your machine manual or a certified technician before performing service procedures.