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Ach. The 30GB is probably much faster. When was it manufactured?
Just because they have the same RPM rating doesn't make them supposed to have equal read speeds. Far from it. You're forgetting a few (lot of) things. Like the fact that a larger platter size (in GB's) has NO EFFECT WHATSOEVER on speeds. You think a 100GB Western Digital is slower than a 120GB WD? Think again. They're the same (unless one is a SE, and has 8MB cache..) Areal Density, however, has a HUGE impact on performance, and HDD's have been increasing in AD by ~30% anually. There's also cache size, and cache speed has some affect as well.
I can't guarantee you, but if the 30GB is newer, it's most likely faster.
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