I think you could be on the right track with questioning whether or not the device itself would store the media. My guess (as I haven't examined one) is that the media card is used for this. Details on the following link:
http://www.gsmarena.com/sony_ericsson_xperia_arc_s-4134.php
suggest that only 320MB is available for the user and my guess is that would be for apps and native application data. I have found this to be the case with a number of other Sony Android handsets.
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