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you are confusing burst with sustained transfer and seek rates, regular sata drives running at 7200 rpm don't outperform similar pata drives in tests.
the raptor's running at 10K rpm are a different story, newer technology is pushing the new sata's faster, the pci bus and ata 133 interface is fast enough except when you get into raid stripes, 4 drives saturated it.
even the newer 16 meg cache drives can only hold ~ 1/3 of a second's worth of data and that's all that can burst thru the interface at 150 or 300 MB/s.
transfer rates go all to hell as soon as you start asking for data from different parts of a platter
a good example of this is try to burn 2 dvd's at the same time from the same hard drive, especially 2 different sets of files
the raptor's running at 10K rpm are a different story, newer technology is pushing the new sata's faster, the pci bus and ata 133 interface is fast enough except when you get into raid stripes, 4 drives saturated it.
even the newer 16 meg cache drives can only hold ~ 1/3 of a second's worth of data and that's all that can burst thru the interface at 150 or 300 MB/s.
transfer rates go all to hell as soon as you start asking for data from different parts of a platter
a good example of this is try to burn 2 dvd's at the same time from the same hard drive, especially 2 different sets of files
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