Sony GTK-XB72 Help Manual page 77

Help Guide
Home Audio System
GTK-XB72
Files cannot be played back.
The data is not stored in the supported format.
USB devices formatted with file systems other than FAT16 or FAT32 are unsupported.
This system supports FAT16 and FAT32, but some USB devices may not support all of these FAT. For details, refer to
the operating instructions of each USB device or contact the manufacturer.
If you use a partitioned USB device, only files on the first partition can be played back.
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