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Pixel dimensions for the 30D are 3504 x 2336. Divide both those numbers by 584 and you will get 6 x 4.
In other words, 4x6 and "original" are the same for the 30D.
Crop factor is sensor size relative to a full-frame ("35mm") sensor. Even though a sensor is smaller, it can have the same aspect ratio as a larger sensor, which is the case when comparing the 30D to a 5D, for example. Aspect ratio is exactly that, a ratio of width to height, and not an absolute size.