External power supply voltage
SOURCE: Power supply for Targus 4 hub usb 2
Most USB hubs do not need an external power supply, except when a connected USB device draws more power than the computer/laptop USB port can supply. In this case an external power supply will need to be connected to the USB hub.
Normally this would be a 5 volt power supply, but make sure the polarity on the connector matches the power connector on the hub, check the label on the hub, sometimes it states to power requirements of the hub as well as the polarity on the connector. Normally the pin on the hub's power connector is positive (ie. +5V)
SOURCE: The HDD is in a Mobile Disk external package. The
This will resolve your issue,
http://www.samsung.com/ph/consumer/monitor-peripherals-printer/hard-disk-drive/35-pata-hdd/SP0802N/index.idx?pagetype=prd_detail&tab=spec&fullspec=F
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