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Transfer rates and hot swapping are no where near the same thing. Transfer rates are the speed at which data is processed from the drive to the motherboard. Hot swap is being able to take one drive that has gone bad and replacing it with a hot spare for data replication.
PATA drive transfer rates peak at about 133mb/s (hence ATA133). SATA drive transfer rates start around 150mb/s. SATA is faster and the cables are much less menacing.
SATA drives can be hot-swapped, assuming you have the right back- or mid- plane to support hotswapping. If you are needing hot swap ability for your machine with SATA drives, I would look for 3Ware or Adaptec hardware.
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"You hear the one about the fella who died, went to the pearly gates? St. Peter let him in. Sees a guy in a suit making a closing argument. Says, "Who's that?" St. Peter says, "Oh, that's God. Thinks he's Denny Crane."
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