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Apple uses Toshiba, Hitachi, Fujitsu and maybe a couple other OEMs.

I have a Toshiba in this one, and my old iBook had one as well. The one in the iBook lasted 4 solid years of backpacking around campus, heh
 
Fujitsu

Ordered the 2.26ghz with 160. Got a Fujitsu. But I swapped it for a seagate 500gb and the Fujitsu lives in an external housing. (And I need to update my sig...)
 
Mine came with a 160GB Fujitsu, it was replaced with a 500GB WD after less than an hour though.
 
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