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Acetates are usually made by dubbing from a master recording in another medium, such as magnetic tape.In the vinyl record manufacturing process, a lacquer master disc is cut and electroforming is used to make negative metal molds from it; certain molds are converted into stampers, can be used to press thousands of vinyl copies of the master.
A CD can be used to store audio, video, and data in various standardized formats defined in the Rainbow Books. CDs are usually manufactured in a class 100 (ISO 5) or better clean room, to avoid contamination which would result in data corruption. They can be manufactured to strict manufacturing tolerances for only a few US cents per disk.
A CD is made from 1.2-millimetre (0.047 in) thick, polycarbonate plastic, and weighs 14–33 grams. [71] From the center outward, components are: the center spindle hole (15 mm), the first-transition area (clamping ring), the clamping area (stacking ring), the second-transition area (mirror band), the program (data) area, and the rim.
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.
Even when CDs became popular during the 1990s, people in English-speaking countries still continued using the term "record shop" to describe a shop selling sound recordings. With the vinyl revival of the 21st century, often generating more income than CDs, the name is again accurate.
A variable-rate CD — also called a flex CD — is a type of certificate of deposit with an interest rate that can fluctuate periodically over the term of the CD based on market conditions.
The CD jewel case is designed to carry a booklet, as well as to have panel inserts. These may be used to display album artwork, lyrics, photos, thank-yous, messages, biography, etc. [5] Because the CD jewel case is the standard, most commonly used CD case, it is much cheaper. The price of the CD jewel case usually ranges from $0.75 to $0.95.
In 1908, Edison introduced Amberol Records which had a playing time of just over 4 minutes. The process of making the finished record was essentially the same as the Gold Molded records, however, a harder wax compound was used. In 1912, celluloid was used in place of wax, and the name was changed to Blue Amberol, as the dye was blue.