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Access the NCK file system via HMI menu path: Diagnostics > File System or via SINUMERIK Operate interface under 'Program Management'. Navigate to the NC memory directory (typically //NC/prog or //NC/subroutines).

Identify and delete obsolete or test part programs using the file manager. Prioritize removal of large .mpf files (main programs) and .spf files (subprograms) that are no longer in production use.

Ensure deleted programs are backed up to external storage (USB, network drive) before permanent deletion to prevent loss of production data.

Verify available free space after deletion by checking the NCK partition status in Diagnostics > System Information > Storage or via MD parameter query for MD 18000 (memory configuration status).

If storage remains critically low after cleanup, implement a file rotation policy: archive completed job programs to external media and store only active production programs in NCK memory.

Navigate to NCK memory file system and locate offset data files in //NC/offsets or //NC/tool directories. Check file sizes and modification dates to identify stale offset tables.

Archive completed tool offset sets to external storage using the HMI export function or SINUMERIK data backup utility. Retain only active tool geometries and workpiece coordinates required for current production runs.

Do not delete offset files for tools currently loaded in the spindle or upcoming jobs without verifying program dependencies.

Review MD 10500 (tool management), MD 10511 (tool table default path), and MD 18410 to confirm NCK storage allocation. If offset table size exceeds available quota, consider relocating offset management to an external database (via OPC or network connection) to reduce NCK memory footprint.

Attempt an NCK file system consistency check via HMI menu path: Diagnostics > File System > Check Integrity or execute the SINUMERIK maintenance function for file system repair (available on some 840D variants via service diagnostics).

File system checking may temporarily lock the machine and prevent program execution; schedule this during maintenance windows.

If file system check identifies errors, perform a controlled NCK file system defragmentation or rebuild: backup all critical files, format the NCK program partition (via HMI or NC command G65 with appropriate P parameter if supported), and restore files in a single organized directory structure.

Formatting the NCK partition erases all stored programs and data; ensure complete external backup before proceeding. This procedure requires machine lockout and is typically performed during scheduled maintenance.

After file system recovery, verify operation by reloading a test part program and monitoring MD 18000 or HMI storage status to confirm alarm no longer triggers.