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The 750 GB drive I received (a 2.3 i7, but should be the same as the 2.0 or 2.2) was a Toshiba.
 
I got Toshiba MK7559GSXF 750GB 5400rpm. It performs well for such kind of HDD. Most time, only 7200 rpm reach 100 MB/s.

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I had my late 2011 MBP replaced with another because of a faulty keyboard backlight, and the difference in hard drive noise was quite substantial. The old one shipped with a Toshiba, and the new one with a Hitachi (HTS547575A9E384). Especially when compared to the Toshiba, the Hitachi is whisper quiet.. So yes, the Toshiba is really quite loud.
 
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