The machine cannot recognize the U-disk, and LCD panel show no U-File when you choose Read U-disk file.
The U disk can be recognized by machine:
Disk capacity:16G(including 16G and below)
The U-disk interface protocol is 2.0
Note: How to judge the protocol of U disk
Insert the USB in the PC/laptop , check in the device manager of the system and check USB port, it will show USB2.0/USB3.0
USB2.0 have four pins, two for power, one pair for data.
USB slot which contains black-USB2.0
Solution:
Change a 2.0 U-disk for testing.
The U-disk file of RDWorks/Lightburn is .rd. Please check if you saved the file correctly.
When saving files to the USB disk, please store them separately, not in a folder on the USB disk.
Solution:
Please save the file with correct way. A video is for reference.
Using U-Disk With Thunder And LightBurn - YouTube
Solution:
Please replace a new U-disk for testing.
If the U-disk and file format are all good, maybe the U-disk on the outside is faulty.
Solution:
Please plug the U-disk to the U-disk port of the controller board ( Open the left door you can see it), see below picture.
If it’s working after you plug the U-disk in the controller board, it maybe the U-disk port of the left side is faulty.