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Access HMI service mode and navigate to Commissioning > Memory > User Memory to check available space on the compact flash card.

If space is critically low (<5%), backup important data to external storage and delete old or unnecessary notebook files from the /user/sinumerik/notebook directory.

Always create backups before deleting files from the control system.

Delete old alarm logs and archived data files using the HMI Archive function or via the file browser to free up space.

Reset the alarm and attempt to create a new notebook entry to verify the issue is resolved.

Power down the control properly and restart the system to see if file system recovery routines resolve the issue automatically.

Use proper shutdown procedure via HMI to avoid further corruption.

Boot into service mode and run file system check utility (CHKDSK) on the compact flash card to detect and repair file system errors.

File system repairs may result in data loss of corrupted files.

Navigate to the notebook directory and attempt to rename or delete the specific corrupted notebook file causing the write error.

If corruption persists, perform a complete backup and reformat the compact flash card, then restore system data from a known good backup.

Complete backup is essential before reformatting to prevent total data loss.

Check if the compact flash card has a physical write-protect switch and ensure it is in the unlocked position.

Access the system via service mode and check file permissions on the /user/sinumerik/notebook directory - ensure write permissions are enabled.

Changing system permissions requires manufacturer password access.

Verify user access level and protection settings in the HMI under Startup > Protection Levels to ensure the current user has write access to notebook functions.

If recent software updates were performed, check MD settings related to file access (check MD11210 and related access parameters) and restore to defaults if necessary.

Machine data changes should be documented before modification.