HOLY CRAP! What was I thinking! you are SO right! Sorry, I lost my mind !
You are correct, the ms should be lower and I achieved that editing the UDMA66 in the registry! I have this HDD:
Western Digital Caviar SE16 WD3200KS 320GB 7200 RPM 16MB Cache SATA 3.0Gb/s Hard Drive
However, since after enabling UDMA66, I gained 4ms, I'll do that again and let it go! Woohoo!