From SpinetiX Support Wiki
The type and number of USB ports varies depending on the player model:
- HMP400, HMP400W
- HMP350, HMP300
- 2 x USB 2.0 ("Hi-speed")
- The USB ports can be used only to update the firmware.
- HMP200, HMP130, HMP100
- 1 x USB 2.0 ("Hi-speed")
- The USB port can be used to update the firmware, to connect USB / serial / USB cellular modem devices, to extend the player storage, and to play content directly from the USB flash drive. It is limited to three endpoints (a USB device might have a varying number of endpoints), nevertheless, the HMP can support a greater number of USB devices through software emulation - this is controlled by the "Support large number of USB devices" option from HMP Control Center > I/O Automation page > USB Settings tab; when mixing full or low-speed devices with high-speed hubs this option should be disabled for compatibility.
Power over USB
In line with the USB specification, the HMP will supply up to 500mA of current at 5V. If a device draws more than the allowed amount, the port will be shut down to protect the HMP.
Hard disks and other devices that use a double-USB connector for increased power cannot be used with the HMP (even with a hub) without external power.
- Video input is not supported via the USB port - video streaming can only be done via Ethernet.
- Multiple USB devices can be connected through USB hubs to the HMP at the same time, but only one USB storage device can be used as external storage.
- The USB ports on the player cannot be disabled, however, unless the HMP is set to look to the USB storage for content, a malicious user could not interfere with the displayed content. For fail-safe security protection of the USB port consider using a physical lock (like these USB port blockers from Lindy).