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The wireless USB keyboard stops working when I connect a USB hard drive. I also tried to connect a non wireless USB mouse together with the USB disk and the mouse stopped working.
I'm running raspbian as OS. The disk was first formated as ntfs, but I have also tried changing the file system to ext4.
The USB disk works well on my Ubuntu laptop.
So is this power related or can something else cause the problem? I'm using the power adapter from an HTC mobile phone.
Just like most other issues with the Raspberry Pi, this is most likely a power issue.
Make sure you are using a short and thick USB cable. And a supply that provides at least 5V at 1A, but I highly recommend using a 5V at 1.2A or 2A supply.
EDIT:
As Steve said, a powered USB hub is also a good idea.
Rasi pi works on minimum amount of power. Connect your USB drive to powered Hub & then connect the powered hub to the Rasi Pi. Also make sure you are supplying adequate amount of voltage to the Pi board.
max_usb_current=1to/boot/config.txtthen reboot (see raspberrypi.stackexchange.com/q/32873/5538).