What does the drop in transfer rate mean on this Opti Drive graph?

Hi,

I recently discovered this nice software called Opti Drive Control. I did a transfer rate test to see if my drive used Constant Linear Velocity or Constant Angular Velocity. It looks like it’s doing CAV. But even after repeating the test 2-3 times, I noticed there’s a drop in the transfer rate between the 1.5 and 2.0 GB marks. Can anyone explain why this happens? Thanks in advance!

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It happens because the drive has a problem reading that part of the disc. This could be a media flaw or a burn problem.

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Thank you very much!