In a double, where two constrictions are available, improved cylinder and modified are a good pairing, especially in fixed-choke guns. If screw-in chokes are an option, try a more forgiving match, like skeet and light modified. Shoot the more open barrel first on the covey rise, then the tighter barrel as the birds make their escape.
The CD and DVD have a single track of data in the form of a spiral, which starts as the center going outwards. The data is stored on the bumps or pits which are then read by the CD/DVD layer. The bumps/pits on a DVD are much smaller than on CD, allowing the DVD to store more data.
MultiRead also bridges the differences between CD and DVD technologies and provides the framework for DVD-ROM drives and recorders to read CD-R and CD-RW discs. Specifically, MultiRead requires that compatible drives read Red Book CD audio and CD-ROM information contained on prerecorded (pressed), CD-R and CD-RW discs.