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.
Unlike DVDs, CDs are not yet available in double-sided or dual-layer formats. DVD Media Digital video discs have a significantly higher storage capacity than CDs and offer a fuller, multi-channel sound (such as surround-sound) experience. There are four types of DVDs: 1. Single-sided discs that hold one layer of data 2. Double-sided discs that hold one layer of data on each side 3. Single-layer discs that hold two layers of data 4. Double-sided discs that hold two layers of data on each side To utilize dual-layer technology, you must have both a compatible disc writer and dual-layer media. The actual number of files you can archive (or burn) on a disc varies depending on the quality level of saved files.