CertiGuide to Network+  9  Glossary

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DVD

Digital Versatile Disc. Similar in appearance to a CD, however it can hold 4.7GB of data on a single side. Utilizing double double-layers on both sides (double layer), capacities of 17GB can be realized on one disk. This is accomplished by using smaller ‘pits’ and a higher wavelength laser. Since the storage like CD is digital, creating additional copies from the first copy does not degrade the data. Today there are several variations of DVD technology. All DVD formats that are capable of any sort of recording have a minimum of 10Gbps data transfer rate.

DVD-ROM playback DVD read-only media for desktop, home entertainment.

DVD-RAM drives provide all the benefits of DVD-ROM with the added advantage of re-writability, hundreds of times. Utilizing Phase Change technology, the same as MO, however it is less expensive. Storage is 2.6GB per side (5.2 Double Sided) Featuring RAndoM Access, it is a better solution for data storage than DVD-RW. Can read CD-ROM, CD-Audio, CD-R, CD-RW, DVD-ROM and DVD-R. DVD-RAM requires a caddy. The media can be removed for playing in another device, however once this is done, it cannot be returned for further recording.

DVD-R is a high capacity (9.4GB on a double-sided disk), high throughput, write-once optical disc. It is akin to CD-R. Rated life is greater than 100 years. Capable of being read in a DVD or DVD-Video player, in addition to DVD-R units.

DVD-RW is a rewritable version of DVD-R. Offering 4.7GB capacity per disc, it is designed as an authoring tool as well as for archiving data. DVD-RW uses DVD-R media, but is rewriteable up to 1,000 times. DVD-RW differs from DVD-RAM in that it records data sequentially, whereas DVD-RAM provides random access to recorded data.

DVD+RW 4.7GB capacity per disc. Differs from DVD-RAM in that it records data sequentially, whereas DVD-RAM provides random access to recorded data. Reads CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-R, DVD-RW, DVD Video, DVD Audio and CD-Audio discs. Does not require a caddy.

A hardware or software component that allows a digital video disc (DVD) drive to display movies on your computer screen.

A type of optical disc storage technology. A digital video disc (DVD) looks like a CD-ROM disc, but it can store greater amounts of data. DVD discs are often used to store full-length movies.

A DVD drive reads both CD-ROM and DVD discs; however, a DVD decoder is necessary to display DVD movies on your computer screen.

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