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A portable USB hard drive is a great way to back up data but what if your USB ports are unable to supply enough "juice" to power the drive?
In fact, the device is powered from two USB ports, since one port is incapable of supplying sufficient current. An external USB hard drive is usually powered by plugging two connectors at one end of a special USB cable into adjacent USB ports on the computer.
USB On-The-Go, often abbreviated USB OTG, is a specification that allows USB devices such as digital audio players or mobile phones to act as a host, allowing other USB devices like a USB flash drive, Mouse, External HarddrivesA or keyboard to be attached to them. Male USB for external power (This allows you to use external HDD, since the power source is external and not from the phone). The Vbus supply from USB socket CON1 turns on transistor Q1 which then turns on power Mosfet Q2.

Unlike conventional USB systems, USB OTG systems can drop the hosting role and act as normal USB devices when attached to another host.
According to the USB specification, USB ports are rated to supply up to 500mA at 5V DC, so two connected in parallel should be quite capable of powering a portable USB hard drive – at least in theory. Instead, when it was plugged into the front-panel USB ports, the drive repeatedly emitted a distinctive chirping sound as it unsuccessfully tried to spin up.
A newly-acquired Maxtor OneTouch4 Mini drive also failed to power up correctly on my home computer, despite working perfectly on several work computers. This then feeds a 6V DC regulated supply from an external plug pack to regulator REG1 which in turn supplies 5V to USB socket CON2.
As with most such drives, it is powered directly from the USB port, so it doesn’t require an external plug pack supply.

One connector is wired for both power and data while the other connector has just the power supply connections. During this process, Windows XP did recognise that a device had been plugged in but that’s as far as it went – it couldn’t identify the device and certainly didn’t recognize the drive. In use, the two connectors are plugged into adjacent USB ports, so that power for the drive is simultaneously sourced from both ports.

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