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

Using an SD card allows you to perform offline engraving on your LONGER Ray5 10W or 5W laser engraver without connecting the machine to a computer. However, you may sometimes encounter issues such as the SD card not being detected, files not appearing, or G-code files failing to load.

These problems are usually related to SD card compatibility, poor contact, file format, or incorrect file settings. This guide provides step-by-step troubleshooting methods to help you quickly identify and fix SD card recognition issues on the Ray5 10W / 5W.

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 problems on the LONGER Ray5 10W / 5W are commonly caused by hardware connection issues, unsupported file formats, or incorrect file storage settings.

By checking the SD card condition, ensuring proper file names and G-code formats, and using a correctly formatted FAT32 card, you can quickly restore reliable offline engraving performance.

For the best experience, use a compatible SD card, keep files organized in the root directory, and test G-code files before starting important engraving projects.