Sony STR-AZ7000ES Startup Manual page 428

Help Guide
Multi Channel AV Receiver
STR-AZ7000ES/STR-AZ5000ES/STR-AZ3000ES
A USB device is not recognized.
Turn off the receiver, then disconnect the USB device. Turn on the receiver again and reconnect the USB device.
Connect a compatible USB device. USB devices are only supported when formatted with the FAT16 or FAT32 file systems.
The USB device does not work properly. Refer to the section on how to deal with this problem in the operating instructions of the USB device.
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