General Sync with iTunes - not enough space - set DC as primary storage?

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http://androidforums.com – So, I bought a 16Gb S3 and thought, 'hey the space is no problem, I'll buy a 64Gb SD card, that's twice the space my iPhone had!' I tried to sync my iTunes with the S3 using 'easy tunes sync' the app seems to work well, but a big problem, 'warning, not enough space!' :( The phone's internal memory is too small, it's true, but my SD is massive. The question I am faced with is, how do I set my SD card to be the default storage location for Music, Videos, etc.?? or am I missing something? It's making me wonder what use is the SD card...? Thanks if you can help (General)