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I don't really know for sure, but I would say these portables probably run between 4200 and 5400 RPM. Like The Duelist said, faster would just chew up the batteries. With the USB 2.0, it really would be impractical to have a higher RPM. Remember also that the smaller discs are more compressed and the lasers are more precise, so a 4200RPM 1.8" drive may write 1GB of data faster then say a standard CPU hard drive at 5400RPM.
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