SATA I vs. SATA II

I just bought a new Seagate SATA-II hard drive to add to my storage space.  Right now it's recognized as a SATA-I HDD in BIOS, which leads to two questions.  1)Is it worth the effort to change it/is SATA-II that much faster, and 2)How would I fix it so it's recognized as SATA-II? 

I have a suspicion it's the jumpers in back, but the way my drives are mounted in my case it would be a bitch to take it out just to change the jumper and find out that's not it.  So what do I do, /comp/?

>>6
7200RPM drives can't internally read and write fast enough to saturate a SATA I (aka SATA, SATA 150) connection. In fact, only the fastest, least fragmented 7200 RPM drives can even come close to needing SATA I over ATA 133 (though you'd see a difference between ATA 100 and ATA 133). SATA II is only useful for 10,000 and 15,000 RPM drives