How to Fix SD Card Not Recognized on Ray5 10W / 5W

When using the SD card (MicroSD/TF card) for offline engraving, you may occasionally encounter issues where the card is not recognized or files cannot be read. This can interrupt workflow and affect productivity.

This guide provides a systematic troubleshooting process to help you identify and resolve SD card recognition issues on the Ray5 10W / 5W quickly and effectively.

Step 1: Basic Inspection (SD Card & Slot)

Start with the most common physical causes:

① Card Type Compatibility
Ensure you are using a MicroSD (TF) card supported by the motherboard.
Check that the card fits properly into the slot.

② Clean the Contacts

• Remove the SD card
• Gently clean the metal contacts (“gold fingers”) using a cotton swab with a small amount of anhydrous alcohol
• Allow it to dry completely before reinserting

③ Check the Slot Condition
Inspect the SD card slot on the mainboard for:

• Dust or debris
• Physical damage

Use an air blower to clean the slot if needed.

④ Ensure Proper Insertion
Insert the SD card fully until you feel or hear a slight “click”, indicating it is locked in place.

Step 2: File & Engraving Settings Inspection

If the SD card is recognized but files cannot be accessed or show errors (e.g., “access denied”), check the following:

① File Name & Format

• Use simple English letters or numbers
• Avoid Chinese characters, special symbols (e.g., @#$%^&), or overly long filenames
• Ensure the file format is supported:
  • .nc
  • .gc
  • .gcode

Make sure your software (e.g., LightBurn) exports files in the correct format.

② File Path Structure

• Do not store files in nested folders
• Place G-code files directly in the root directory of the SD card
• Avoid encrypted or protected files, as they cannot be read by the machine

③ G-code File Integrity
Sometimes files may be corrupted or contain unsupported commands.

Troubleshooting method:

• Create a simple test file (e.g., a basic square engraving)
• Save it as a new G-code file and load it onto the SD card
• If the test file works, the original file may be corrupted or incompatible

Additional Tips

• Try a different SD card to rule out hardware failure
• Reformat the SD card to FAT32 before use (backup files first)
• Avoid using very large-capacity or low-quality cards

Conclusion

SD card recognition issues are usually caused by physical contact problems, incompatible file formats, or incorrect file structures. By following this step-by-step troubleshooting guide, you can quickly identify the root cause and restore normal operation.

For best results, always use properly formatted SD cards, keep file names simple, and regularly check the integrity of your G-code files to ensure smooth offline engraving.