I think your getting confused over the marketing hype for SATA. SATA 300 is also known as 3 gigabit. 300 megs times 8 gives you 2.4 gbits, sprinkle some magical fairy dust and it's 3 gigabits.
SATA supports up to 150 / 300 MB/s interface bandwidth, but that's the technologies interface throughput (much like PATA's 100/133 MB/s theoretical speed), in reality, your still stuck with PATA based technology, that is, hard drives still running at 7,200 rpm (exception being Raptor 10k drives). Sure there is the newish SATA native command queueing technologies (idea pinched from SCSI technology) which can boost performance by a teeny fraction (albeit using higher cpu usage), but your still stuck with drives based essentially on old technology.
So I'd say hotplugging, slightly faster MB/s transfers and significantly better cable management are the pluspoints that SATA drives have over PATA.
Think of PATA to SATA like that of AGP to PCI-E. For example the AGP 4/8x bus still isn't even saturated today when running the latest highest quality games, but yet we now have PCI-Express.
But those figures pancake mentioned, give or take a few MB/s are correct.
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