1

I've recently got my Raspberry Pi 2 and I'm having issues mounting my external USB drive. Symptoms are the following:

  • In /dev I only find /dev/sda and NOT /dev/sda1
  • When trying to mount /dev/sda /mnt/mydrive, I get the message mount: /dev/sda: can't read superblock
  • If I type dmesg I found a message that reads [sda] READ CAPACITY failed
2

Turns out the hard drive is not getting enough power and that's why the Raspberry Pi can't read it properly. Some people suggest using a powered USB hub but in case you are powering your Pi with a decent power supply (e.g. 2A one), you can tell the Pi to increase the power supply to the USB ports by adding the option below

max_usb_current=1

to

/boot/config.txt

Just reboot your Pi and the USB port will provide enough power for your hard drive to work correctly. If the drive works correctly, you should find now a /dev/sda1 that you can just mount.

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