So I'm pretty new to servers; I've been running websites off of 3rd party hosts, but I thought I might like to try it on my own for once. I got a Raspberry Pi running Raspian Wheezy, and I successfully installed Apache2.
When I tested Apache for the first time before modifying any settings, it returned the "Everything is working fine!" message. However, I have an external USB drive that I wanted my webroot to reside on. I went into the file /etc/apache2/sites-enabled/000-default, and changed the DocumentRoot and Directory from /var/www/ to the following address that specifies a folder I made in my mounted device.
Options Indexes FollowSymLinks MultiViews
allow from all
When I tried to load my localhost again, I was met with a 403 forbidden error. After doing some looking around, it seemed that taking ownership of the folder would solve this problem. I tried inputting
sudo chown -R www-data:www-data /media/888F-2455/www into my root terminal, but I was told
chown: changing ownership of `/media/888F-2455/www/index.html': Operation not permitted
Which I can't understand since I'm a root user using the root terminal.
What is going on here and how can I fix it? Please answer like you're talking to an 8 year old because I'm not very adept at linux or apache at this point in time.