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This Pioneer CLD-1030 unit is capable of playing both sizes of Laserdiscs, as well as Compact discs and CD Video discs. Later models added support for DVDs. Most players made after the mid-1980s were capable of also playing audio CDs. These players included a 4.7 in (12 cm) indentation in the loading tray, where the CD would be placed for play.
These were referred to as CD Video (CD-V) discs, and Video Single Discs (VSD). CD-V was a hybrid format launched in the late 1980s, and carried up to five minutes of analog LaserDisc-type video content with a digital soundtrack (usually a music video), plus up to 20 minutes of digital audio CD tracks.
Disc rot is the tendency of CD, DVD, or other optical discs to become unreadable because of chemical deterioration. The causes include oxidation of the reflective layer, reactions with contaminants, ultra-violet light damage, and de-bonding of the adhesive used to adhere the layers of the disc together.
Typically, the sale of laser pointers is restricted to either class 3A (<5 mW) or class 2 (<1 mW), depending on local regulations. For example, in the US, Canada and the UK, class 3A is the maximum permitted, unless a key actuated control or other safety features are provided. [ 31 ]
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Disc changers capable of holding up to 400 discs at once were available. Also, the user can manually choose the disc to be played, making it similar to a jukebox. They were often built into car audio and home stereo systems, although 7 disc CD changers were once made by NEC and Nakamichi [36] for PCs. Some could also play DVD and Blu-ray discs.
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Videodisc (or video disc) is a general term for a laser- or stylus-readable random-access disc that contains both audio and analog video signals recorded in an analog form. Typically, it is a reference to any such media that predates the mainstream popularity of the DVD format.
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