What is the most common word in use to describe 'DVD' and what is its measure word
I had always used guanng pan (光盘) with ge (个), however I am told that it would be better to use pan (盘) or zhang (张). DVD is commonly used as is die pian (碟片) with the measure word bu (部) or zhang (张).

According to my Chinese friend DVD is most commonly used.

You will also hear wu（五 or jiu（九）after DVD if you're in a shop to signify the type of DVD (DVD 5 or DVD 9).