Hello, So, I have an older 24" iMac. I upgraded the hard drive to a 1TB one. But that is getting fuller and fuller every week. I notice a few areas filling up...my Photo library, iTunes library and my iMovies and iDVD files. I am not sure which library is sucking up more storage space but want to push one (or more) of these to an External Hard Drive. My machine only has USB 2. Obviously when i decide to upgrade (maybe next year) I will have more connection options...USB 3, Thunderbolt, etc. Which would be the better library to push to an external hard drive? Photos or Music Not sure if editing a photo (RAW Files) via external would be horrendously slow or if listening to Music would be too slow. Thanks in advance!