User blog comment:Garhdo/Extended Cut - opinions?/@comment-5167830-20120627040425/@comment-1341687-20120627042420

They have to do a lot of things. Handle music, renderings (both in game and pre), art as well as the ability to analyze data being given to them so they properly display things like flashbacks to who has died, your love interest, etc. Audio files, especially depending on compression can be huge. Heavenly Sword takes about 3-5 hours to beat and if memory serves, the audio alone was 8.5GBs.