& your post does not do much to help.
Here we go!!!!
HDs for pcs spin at many different speeds depending on what they were designed for.
Most laptops for a long time would spin @ 4200rpm primarily to conserve battery time & they would also go into hibernation most times .
They can now be had @ 5400rpm & 7200rpm for laptops.
Most desktop pc hds spin at 7200 rpm now. 5400rpm was very popular for a long time.
Enterprise design hds will usually spin @ 10,000rpm (sata or scsi) or 15,000 rpm (scsi only)
Now the 150mb/sec figure you are talking about relates to the sata drive interface/controller speed & has nothing to do with the 10,000rpm hd motor speed
IDE interfaces top out at 133, scsi equivalent is 160.
The 15,000rpm scsi drives can deliver a max of 320mb/s & they cost a lot more than your raptor.
SO NOW!!! just attach your hd & enjoy the additional speed,,, if you notice it.