the 00RKKA0 access time is 20ms
the 08RKKA0 access time is 15ms
the 00ZF5A0 access time is 20ms or 15MS ???
the 00RKKA0 access time is 20ms
the 08RKKA0 access time is 15ms
the 00ZF5A0 access time is 20ms or 15MS ???
Somewhere around that dude
check the specs here
http://wdc.custhelp.com/app/answers/detail/search/1/a_id/1400#
you can use HD tune to test the drive performance