I'm trying to follow intructions found here (http://www.makeuseof.com/tag/how-to-turn-your-raspberry-pi-into-an-always-on-downloading-megalith/) on How To Turn Your Raspberry Pi Into An Always-On Downloading Megalith, but I'm stuck at the 3rd step (
sudo fdisk /dev/sda).
The error I get is the following: fdisk: unable to open /dev/sda: No medium found and when I
ls /dev I can see the sda there. Also, I can see my device in
ls -l /dev/sd* returns
brw-rw---T 1 root floppy 8, 0 Jan 5 17:28 /dev/sda
What else should I do?