# adb shell ls /system/etc/permissions/android.hardware.usb.host.xml
/system/etc/permissions/android.hardware.usb.host.xml

# adb shell ls /system/etc/permissions/android.hardware.usb.host.xml
/system/etc/permissions/android.hardware.usb.host.xml: No such file or directory

/storage/UsbDriveA     (Samsung devices)
/storage/USBstorage1   (LG G4, V10, G3, G2, LG devices)
/storage/usbdisk       (Moto Maxx, Turbo 2, Moto X Pure, Motorola devices)
/storage/usbotg        (Sony Xperia devices, Lenovo Tabs)
/storage/UDiskA        (Oppo devices)
/storage/usb-storage   (Acer Iconia Tabs)
/storage/usbcard       (Dell Venue -- Vanilla Android 4.3 tablet)
/storage/usb           (HTC One M7, some Vanilla Android tablets)