Originally Posted by James Craner
Just one final thought, I don't know where you work or how relaxed your boss is about having personal files on a work computer, but if you were working for me and I discovered that one of my employees had a load of personal files on his work computer (normally discovered as a result of someone in IT doing some maintenance work on your computer) then I might wonder how much time he has been spending on his personal projects rather than working for me.
I have not touched on the fact that some companies might have an issue with work stuff being on a cloud service like dropbox anyway. Might not be an issue in your case, but I just wanted to highlight the issue.
Yikes! It's stuff like this that reminds me of how lucky I am to work for a smaller company that trusts its employees. We all get to choose a laptop that we are allowed to do pretty much anything we want with - except holding the company liable for what we do!
My two thoughts, are Knox (this'll let you encrypt folders with a password)https://agilebits.com/knox
Or as others have suggested, using an encrypted disk image.