DVD...

dalam bahasa indonesia

apa itu dvd

DVD adalah sejenis cakram optis yang dapat digunakan untuk menyimpan data, termasuk film dengan kualitas video dan audio yang lebih baik dari kualitas VCD. "DVD" pada awalnya adalah singkatan dari digital video disc, namun beberapa pihak ingin agar kepanjangannya diganti menjadi digital versatile disc agar jelas bahwa format ini bukan hanya untuk video saja. Karena konsensus antara kedua pihak ini tidak dapat dicapai, sekarang nama resminya adalah "DVD" saja, dan huruf-huruf tersebut secara "resmi" bukan singkatan dari apapun.

Terdapat pula perangkat lunak yang membolehkan pengguna back-up DVD sendiri seperti DVD Decrypter dan DVD Shrink.

http://id.wikipedia.org/wiki/DVD

english languange

what is this dvd

DVD (also known as "Digital Versatile Disc" or "Digital Video Disc" - see Etymology) is a popular optical disc storage media format. Its main uses are video and data storage. Most DVDs are of the same dimensions as compact discs (CDs) but store more than six times as much data.

Variations of the term DVD often describe the way data is stored on the discs: DVD-ROM has data which can only be read and not written, DVD-R and DVD+RDVD-RW and DVD+RW can both record and erase data multiple times. The wavelength used by standard DVD lasers is 650 nm^[1], and thus has a red color. can only record data once and then function as a DVD-ROM.

DVD-Video and DVD-Audio discs respectively refer to properly formatted and structured audio and video content. Other types of DVDs, including those with video content, may be referred to as DVD-Data discs. As next generation High definition optical formats also use a disc identical in some aspects yet more advanced than a DVD, such as Blu-ray Disc, the original DVD is occasionally given the retronym SD DVD (for standard definition).

history

In 1993, two high-density optical storage formats were being developed; one was the MultiMedia Compact Disc (MMCD), backed by Philips and Sony, and the other was the Super Density (SD) disc, supported by Toshiba, Time Warner, Matsushita Electric, Hitachi, Mitsubishi Electric, Pioneer, Thomson, and JVC.

Representatives of the SD camp approached IBM, asking for advice on the file system to use for their disk as well as looking for support for their format for storing computer data. A researcher from IBM's Almaden Research CenterVHS and Betamax of the 1980s, he convened a group of computer industry experts (including representatives from Apple, Microsoft, Sun, Dell, and many others); this group was referred to as the Technical Working Group, or TWG. The TWG voted to boycott both formats unless the two camps agreed on a single, converged standard. Lou Gerstner, President of IBM, was recruited to apply pressure on the executives of the warring factions. Eventually, the computer companies won the day, and a single format, now called DVD, was agreed upon. The TWG also collaborated with the Optical Storage Technology AssociationUniversal Disk Format (UDF), for use on the new DVDs. received that request, and also learned of the MMCD development project. Wary of being caught in a repeat of the costly videotape format war between (OSTA) on the use of their implementation of the ISO-13346 file system, known as

Philips and Sony abandoned their MultiMedia Compact Disc and agreed upon a spec mostly similar to Toshiba and Matsushita's Super Density Disc except for the dual-layer option (MMCD was single-sided and optionally dual-layer whereas SD was single-layer but optionally double-sided) and EFMPlus modulation. EFMPlus was chosen as it has a great resilience against disc damage such as scratches and fingerprints. EFMPlus, created by Kees Immink, who also designed EFM, is 6% less efficient than the modulation technique originally used by Toshiba, which resulted in a capacity of 4.7 GB as opposed to the original 5 GB. The result was the DVD specification, finalized for the DVD movie player and DVD-ROM computer applications in December 1995.^[4] In May 1997, the DVD Consortium was replaced by the DVD Forum, which is open to all other companies.

Etymology

"DVD" was originally used as an initialism for the unofficial term "digital videodisk".^[5] It was reported in 1995, at the time of the specification finalization, that the letters officially stood for "digital versatile disc" (due to non-video applications),^[6] however, the text of the press release announcing the specification finalization only refers to the technology as "DVD", making no mention of what (if anything) the letters stood for.^[4] A newsgroup FAQ written by Jim Taylor (a prominent figure in the industry) claims that four years later, in 1999, the DVD Forum stated that the format name was simply the three letters "DVD" and did not stand for anything.^[7]

The official DVD specification documents have never defined DVD. Usage in the present day varies, with "DVD", "Digital Video Disc", and "Digital Versatile Disc" being the most common.

The DVD Forum website has a section called "DVD Primer" in which the answer to the question, "What does DVD mean?" reads, "The keyword is 'versatile.' Digital Versatile discs provide superb video, audio and data storage and access -- all on one disc."[8]

DVD capacity

Capacity and nomenclature^[9][10]

Designation		Sides	Layers (total)	Diameter	Capacity
				(cm)	(GB)	(GiB)
DVD-1[11]	SS SL	1	1	8	1.46	1.36
DVD-2	SS DL	1	2	8	2.66	2.47
DVD-3	DS SL	2	2	8	2.92	2.72
DVD-4	DS DL	2	4	8	5.32	4.95
DVD-5	SS SL	1	1	12	4.70	4.37
DVD-9	SS DL	1	2	12	8.54	7.95
DVD-10	DS SL	2	2	12	9.40	8.74
DVD-14[12]	DS DL/SL	2	3	12	13.24	12.32
DVD-18	DS DL	2	4	12	17.08	15.90

The basic types of DVD are referred to by a rough approximation of their capacity in gigabytes.

The 12 cm type is a standard DVD, and the 8 cm variety is known as a mini-DVD. These are the same sizes as a standard CD and a mini-CD, respectively. The capacity by surface (MiB/cm²)differs from 6.92MiB/cm² in the DVD-1 to 18.0 MiB/cm² in the DVD-18

Note: As with hard disk drives, in the DVD realm gigabyte and the symbol GB are usually used in the SI sense, i.e. 10⁹ (or 1,000,000,000) bytes. For distinction, gibibyte with symbol GiB is used, i.e. 2³⁰ (or 1,073,741,824) bytes. Most computer operating systems display file sizes in gibibytes, mebibytes and kibibytes labeled as gigabyte, megabyte and kilobyte respectively.

Each DVD sector contains 2418 bytes of data, 2048 bytes of which are user data.

http://en.wikipedia.org/wiki/DVD