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When connected to the computer with USB-A OTG, it becomes a real USB flash drive.
Note:
# Must make sure that the CM4 module is correctly installed on the expansion board before powering on.
# Raspberry Pi Compute Module 4(CM4）is not included in the packing list.
# USB-A and USB-AF/USB-C ports cannot be used at the same time. The USB-AF and USB-C power supply ports can be used at the same time.
The USB interface is disabled to save power by default on the CM4 . To enable it you need to add dtoverlay=dwc2,dr_mode=host to the config.txt file