help with install on Seagate FreeAgent USB drive

[elmo]

>  
> I downloaded the Ubantu image, put it on a CD and It wants to install on my C drive. 
>
>   
This is a critical step that can be confusing.

First, You didn't download the Ubuntu IMAGE, you downloaded an ISO file 
which is a compressed version of the IMAGE. ISO is a single file made up 
of several IMAGE files. These IMAGE files need to be extracted from the 
ISO file and burned onto a CD.

If you did the download with Windows and have a CD/DVD burner like Nero 
available, take look in the burner for something that burns an IMAGE. 
This will simultaneously extract the files from ISO and burn them onto 
the disk as the IMAGE.

Now you can proceed with the installation or simply run the disk without 
installing.