Raspberry Pi B+ USB Power: Difference between revisions
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Revision as of 00:09, 2 December 2014
It seems that the Raspberry Pi B+ by default is not configured to power a 2.5 inch self powering USB hard disk. By default it seems that the USB ports on the B+ only allow USB power for about 400mA. A USB hard disks uses 600mA at a minimum.
To increase the USB power to 1.2 amps
vi /boot/config.txt
add the line
max_usb_current=1
I believe this changes the gpio pin 38 value from 0 to 1 which opens a second resistor in parallel allowing for higher amperage over USB.
