What's the difference between the Maxtor 6B200R0 and 6L200R0? I've done research on this, but I've only found that there are a lot less search results for 6L200R0. Also, 6L200R0 is not found on the Maxtor website. My local store has both, the 6B200R0 costs $139 CAD and the 6L200R0 $145 CAD, and the 250gig versions cost $169 and $189 respectively, so the 6L is more expensive, but why?