Sony CRX210A(1) Turns off and on while burning is this right?

I recently purchased a Sony CRX210a1 48/12/48 CDR-W. When I burn a CD the amber lite that indficates its burning turns off and on. My old TDK 24x drive would not do this. The only reason I am concerned is because my burning time is the same as when I had a 24x 4+ mins.
I currently have the drive on the same channel as my Harddrive (with no ability to move it) the harddrive is set to master and the CDR-w is set to slave.

Am I missing something here or should I take this back?

Thanks much