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How DVD player differentiates different recordable disc?

There are different DVD recordable media formats like DVD-R, DVD+R etc. How DVD drive checks the particular type of Disc?
How player differentiates it?
bharathi, January 2005
It checks the disc parameters in the media code data block, from which it can determine the manufactured layers/grooves, read/write speeds etc.

Cobweb, January 2005