Movies over two hours long often use a D9 disc.
Though they may be difficult to distinguish from each other by sight, there are actually numerous types of DVDs, all of which vary in storage capacity. DVD-5 and DVD-9, or D5 and D9, formats are the most common types of DVD. The D9 disc is something of a mid-range option; though it sports a higher storage capacity than the D5 disc, other less common types of DVDs feature even greater capacities.
Specifications
DVD-9 discs hold 8.4 GB of data, or about 240 minutes worth of video footage. These discs are dual-layered, meaning they contain two layers of data. DVD players read layer 0, the bottom layer, first and layer 1, the top layer, last. Unlike other types of DVDs, these single-sided discs do not have to be flipped at any point during playback.
Reading and Authoring
When reading a DVD-9 disc, the DVD player's laser reads outward from the center of the disc. Once the player has read layer 0, it readjusts the depth of the laser to read layer 1 from the outside in. This process is known as a "layer break," which manifests as a brief, one- or two-second pause when viewing a film. Alternatively, DVD authors can create D9 discs with a parallel track path, meaning the player will read layer 1 from the center outward, just as it read layer 0.
Considerations
Most mass-market home video DVD releases use DVD-5 or DVD-9 discs, depending on the length of the film. However, do-it-yourself DVD authors can purchase blank D9 discs, commonly known as DVD-R DL, or "Dual Layer." As is the case with other DVD formats, data written outside of a 58 mm radius on the DVD may lead to faulty playback, including skips or stutters.
Other Types
D5 DVDs, the most common type of DVD, hold 4.7 GB of data, or about 133 minutes of video in high-quality encoded MPEG-2 format with three-channel surround sound audio. This type of DVD has a single side and a single layer. The less common D10, a dual-sided DVD with a single layer, holds 9.4 GB of data and around 133 minutes of video on each side, or 266 minutes total. Dual-sided, dual-layered D18 discs store 15.9 GB of data and 240 minutes of footage on each side.
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