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I have a Raspberry Pi 2 Model B and a 2,5 inch HDD that I want to connect via USB. The HDD also powers itself over USB. Does the Raspberry Pi 2 Model B provide enough power? Can I safely run the HDD without breaking any of the two devices?

Socrates
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2 Answers2

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You SHOULD be able to power a HDD from the Pi2 (provided you use an adequate power supply AND set max_usb_current=1). The max USB current is 600/1200mA depending on max_usb_current

Unfortunately adequate power supplies are not common. See the comments in https://raspberrypi.stackexchange.com/a/47642/8697 Even though this is Pi3 the issues are the same and the power circuitry very similar.

Community
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Milliways
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No, it does not! You can harm your RPi board seriously if you will power your HDD from it, even attaching a 5Amp PSU : the RPi board is simply not designed for such currents. Use a USB hub with external PSU and it will be OK, or - if you're about to use just a one more PSU for your HDD, make sure you've connected it's GND(Ground) with the one supplied to RPi

Alexey Vesnin
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