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Compared to a CD's 1.2 mm layer of polycarbonate, a DVD's laser beam only has to penetrate 0.6 mm in order to reach the recording surface. This allows a DVD drive to focus the beam on a smaller spot size and to read smaller pits. DVD lens supports a different focus for CD or DVD media with same laser.
Using CD-R, it is possible to write data once on a disc at home without the stamping equipment required for CD-ROMs. These are considered write once, read many disks. CD-RW: (Compact Disc Re-Writable) same as the CD-R but can be erased and reused. There is a limit on how many times a CD-RW can be written. Presently this limit is 1,000 times.
An external CD/DVD SuperDrive. SuperDrive is the product name for a floppy disk drive and later an optical disc drive made and marketed by Apple Inc. The name was initially used for what Apple called their high-density floppy disk drive, and later for the internal CD and DVD drive integrated with Apple computers.
It was resolved with both surviving however: DVD-R predominating for stand-alone DVD recorders and players, and (for computers) most DVD devices being engineered as dual format, to be compatible with both. As of 2007 DVD is the de facto standard for pre-recorded movies, and popular storage of data beyond the capacity of CD.
This list includes both CD, DVD and Blu-ray recordable and rewritable media manufacturers (like Ritek), and disc replicators (companies that replicate discs with pre-recorded content, like Sony DADC).
A combo drive is a type of optical drive that combines CD-R/CD-RW recording capability with an ability to read (but not write) DVD media; some manufacturers refer this as CD-RW/DVD-ROM drive. The term was used almost exclusively by Apple as a name for the low-end substitute for their high-end SuperDrive , as the latter was designed to both read ...
Verbatim started its successful foray into the optical disc market in 1993 with CD-R media. In 1997, Verbatim released the world's first CD-RW format media. In 2001, Verbatim released the world's first DVD+R format media. Introduced the first 8.5 GB DVD+R DL products in 2004, followed by DVD-R DL in 2005.
The CD-ROM was introduced in 1985, providing much higher capacity than a floppy disk, however could not be written to. This was resolved in 1990 with the introduction of the CD-R . [ 16 ] [ 17 ] The CD-RW , introduced in 1997 allowed the CD to be written to multiple times, rather than just once, as with the CD-R. [ 18 ] DVD versions of these ...
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