Edited by silentcreek at Thu Dec 4, 2014 06:58 |
I'd say you have a hard drive that takes too much power to spin up when it's turned on.
I tested several USB hard drives with my Banana Pi and I also found one that doesn't work (while most work). My suspicion about the one drive that didn't work is that it's a drive with 7200rpm which requires more power to spin up (it's also louder than the other drives I tested). The one drive that I couldn't get to work was Western Digital Elements 750GB USB3.0. The other drives that work fine are Toshiba USB hard drives.
I would suggest you get a powered USB hub with enough power to supply the external hard drive. This will give you another advantage btw: If you use a USB hub that provides power for your hard drive, then the power management unit (PMU) of your Banana Pi will stay cooler as well (in my case, depending on the load, that makes a difference of up to 5°C).