If you have installed a USB Drive, you will want to point your Apache server to use a folder on that USB Drive.
So instead of the default location of /var/www you want the configured server to point to /websites/www.
The Apache document root was set by default to /var/www/html. It was configured in the following file:
So type in:
and change the following line to what you want, in my case is /websites/www/html:
Also do a:
and find this
Options Indexes FollowSymLinks
Require all granted
and change /var/www/ to your preferred directory which in my case is:
and save it by pressing Ctrl+ X and Y and return key.
After you saved your changes, just restart the Apache webserver.