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While this method is more expensive, it forms a bond that is resistant to temperature extremes The label surface of this disc can be printed using conventional printing techniques or silk-screening Impressions molded into the blank substrate can also be used as a substitute for printing a label
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Figure 2 - 7
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Layers within a DVD-5 disc
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Label Polycarbonate Bonding layer Reflective layer Polycarbonate Laser beam
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A DVD-9 utilizes two separate layers of data The data layer closest to the laser is composed of a semi-re ective coating that enables the laser to focus on it for data reading or to focus through it to the next higher layer to read the data from the more re ective surface The capacity of the DVD-9 disc, shown in Figure 2 - 8, is 85 Gigabytes The two substrates of a dual-layer disc are bonded together using one of two methods: By means of an optically transparent adhesive lm that af xes the layers to each other Through a photopolymer material that combines the second layer on top of the rst on a single substrate which is then bonded to the blank substrate
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Conventional methods of lithographic printing or screened printing can be used to complete the label
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Figure 2 - 8 Layers within a DVD-9 disc
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Label Polycarbonate Reflective layer Bonding layer Semi-reflective layer Polycarbonate Laser beam
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A DVD-10 disc has data on both substrates, using re ective layers on each so that the disc must be physically ipped over in the DVD player or DVD-ROM drive in order to read the data on the second side This format has a capacity of 94 Gigabytes Since the laser must be directed through both surfaces of the disc, no label is applied to either surface this is a quick way to recognize this particular format, shown in Figure 2 9
Figure 2 - 9
Layers within a DVD-10 disc
Polycarbonate Reflective layer Bonding layer Reflective layer Polycarbonate Laser beam
The most complex DVD format, and the most expensive to manufacture, is the DVD-18 disc, which includes both dual sides and dual layers, as shown in Figure 2 - 10 The two layers on each side must be manufactured on a single substrate One layer is created on a substrate using a conventional stamper to produce the data pattern and then a second stamper creates a data image on a photopolymer material, which is then
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af xed to the substrate This same process is followed for the second substrate, which also contains two layers of data, providing a total capacity of 179GB As with a DVD-10 disc, this type of disc must be turned over in the player or the DVD-ROM drive in order to access the data on the second side Similarly, neither surface can be printed with a label, since it must offer clear access to the laser for data reading
Figure 2 - 10
Layers within a DVD-18 disc
Semi-reflective layer Polycarbonate Reflective layer Bonding layer Reflective layer Polycarbonate Semi-reflective layer Laser beam
Storing Content on DVD
As you can see from the previous description, the addition of new layers to a disc, each with its own microscopic spiral of data, adds to the complexity of manufacturing For this reason, and the additional costs associated with multilayer disc manufacturing, many commercially released DVD titles utilize only a single layer This is suf cient to store a typical 135-minute lm For longer works, or for including multiple movie titles on a single disc, additional layers can be added to the disc to achieve the desired capacity Approximately 2 Gigabytes of storage is required for each hour of video material compressed with MPEG-2 Title producers can determine the amount of storage needed for a project and then master the disc accordingly Unlike a compact disc, which employs a single substrate, a DVD is composed of two 06 millimeter substrates that are combined to increase the rigidity The additional rigidity is also important for the overall disc balance and reducing the amount of wobble while the disc is spinning both critical characteristics for ensuring accurate reading of data from the medium
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