Seagate Barracuda 7200.10 500GB

[matt631]

Can anyone tell me does the

Seagate Barracuda 7200.10 500GB ST3500630AS SATA-II 16MB Cache - OEM
http://www.overclockers.co.uk/showproduct.php?prodid=HD-084-SE

and

Seagate Barracuda 7200.10 750GB ST3750640AS SATA-II 16MB Cache - OEM
http://www.overclockers.co.uk/showproduct.php?prodid=HD-077-SE


have a 300mbs transfer rate as i cant seem to find any information on the drive itself other than its Sata II...


Also

Are leads that are branded as Sata II any better than Sata I or are they a con!!

Thanks in advance guys and girls