SATA300

[Jason Lenthe]

My machine, a home-brew running 7.0-RELEASE-p2, has 3 SATA hard drives 
all of which were advertised as SATA300 drives, but:

vader# dmesg | grep ATA
ata0: <ATA channel 0> on atapci0
ata1: <ATA channel 1> on atapci0
atapci1: <Intel ICH7 SATA300 controller> port 
0x20c8-0x20cf,0x20ec-0x20ef,0x20c0-0x20c7,0x20e8-0x20eb,0x20a0-0x20af 
irq 19 at device 31.2 on pci0
ata2: <ATA channel 0> on atapci1
ata3: <ATA channel 1> on atapci1
ad4: 305245MB <Hitachi HDT725032VLA360 V54OA7EA> at ata2-master SATA150
ad5: 476940MB <MAXTOR STM3500630AS 3.AAE> at ata2-slave SATA150
ad6: 305245MB <Hitachi HDT725032VLA360 V54OA7EA> at ata3-master SATA150

Does this mean I'm only getting half the throughput I could be getting?

Thanks,
Jason