Install from USB Drive trys to install on USB drive

I am trying to install FreePBX using a USB drive. It starts fine asking for the ethernet info and then downloads the image2.

I then get a screen saying it ran out of space and could not continue.

The USB drive was overritten.

I am Linux impaired so I am not sure how to change the install.

If I create a CD install it will work but the actual hardware I will be using will not have a CD drive.

Based upon the installtion instructions the USB install should work.

Thanks for any help.