Normally, the airspace surrounding Class D airports extends from the surface up to a designated MSL altitude - usually about 2,500 feet AGL. Entry requirements: To enter Class D airspace, a pilot must contact the control tower and establish two-way radio communications prior to entering the airspace.
Embedded Data: A DVD-R disk (also applies to DVD+R) which still has space available. Data is burned onto the disk with a writing laser. DVD recordable and DVD rewritable refer to part of optical disc recording technologies.
4. DVD-R canât be played in a CD car stereo while a CD-R can be played in both CD and DVD players. 5. CD-R has a much cheaper price than a DVD-R; however, the difference is not that significant compared to how expensive DVD-Rs used to be.