should 1 partition sata drive in quicksilver

I am upgrading my wife' s quicksilver with a sonnet sata controller and 1 Tbyte drive. We must have room for all those pictures.

all the picture end up in her user folder which is on the startup drive ie the new drive should I partition it or not. Having multiple drives does not work with her in that she can not direct the files any where else. We have a small computer literacy issue their. what is the advice of the mac power gurus

michael