Cakram optik

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  Optical disc authoring  t·s·é 
Tipe media optik
Standar
Bacaan satuluyna
Lénsa optik nu maca compact disc.

Dina komputasi, réproduksi sora, jeung vidéo, hiji cakram optik nyaéta hiji cakram nu rata tur buleud (biasana polikarbonat) tempat nyimpen data dina legok (pit) (atawa tonjolan (bump)) dina beungeut ratana (flat surface) — nu ngaruntuy (sequential) ngawangun tapak (track) nu tuluy tumuluy (kontinyu) tur wangunna spiral nu ngagedean ti tapak pangjerona (innermost track) tepi ka tapak pangluarna (outermost track), tepikeun ka nutupan sakabéh beungeut cakram. Data diaksés dina jero cakram nalika hiji bahan husus (seseringna mah aluminium) disorot ku dioda laser. Legok-legokna ngaganggu ampulna (refleksi) cahaya laser, nu ku sabab eta, kalolobaan cakram optik (kajaba cakram hideung dina konsol kaulinan vidéo (video game console) PlayStation asli), sacara husus boga panémbong (appearance) nu mangrupa-rupa kelir (iridescent) nu dijieun ku alur (groove) tina lapisan nu ngampulkeun (reflective layer).

Sajarah[édit | sunting sumber]

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Bantosanna diantos kanggo narjamahkeun.

In 1961 and 1969, David Paul Gregg registered a patent for the analog optical disc for video recording, (US Patent 3,430,966). It is of special interest that US Patent 4,893,297, filed 1968, issued 1990, generated royalty income for Pioneer Corporation’s DVA until 2007 — encompassing the CD, DVD, and Blu-ray disc systems. In the early 1960s, the Music Corporation of America bought Gregg's patents and his company, Gauss Electrophysics.

Likewise, in 1969 Holland, Philips Research physicists began their first optical videodisc experiments at Eindhoven. In 1975, Philips and MCA join efforts, and in 1978, commercially much too late, they presented their long-awaited laserdisc in Atlanta, Georgia, USA MCA delivered the discs, Philips the players; the presentation was a technical and commercial failure; the Philips/MCA cooperation ended.

In Japan and the U.S., Pioneer succeeded with the videodisc until the advent of the DVD. In 1979, Philips and Sony, in consortium, successfully developed the compact disc in 1983. The Optical Storage Technology Association (OSTA) promote standardised optical storage means. Although optical discs are more durable than earlier audio-visual and data storage formats, they are susceptible to environmental and daily-use damage. Libraries and archives enact optical media preservation procedures to ensure continued usability in the computer's optical disc drive or corresponding disc player.

Generasi kahiji[édit | sunting sumber]

Initially, optical discs were for storing music and computer software. The laser disc format stored analog video signals, but, commercially, lost to the VHS videotape cassette, mainly its high cost and non-recordability; other first-generation disc formats are designed solely to store digital data.

Most first-generation disc devices had an infrared laser reading head. The minimum size of the laser spot is proportional to its wavelength, thus wavelength is a limiting factor against great information density, too little data can be stored so. The infrared range is beyond the long-wavelength end of the visible light spectrum, so, supports less density than any visible light colour. One example of high-density data storage capacity, achieved with an infrared laser, is 700MB of net user data for a 12 cm compact disc.

NOTE: other factors affecting data storage density are, for example, a multi-layered infrared disc would hold more data than an identical single-layer disc; whether CAV, CLV, or zoned-CAV; how the data are encoded; how much clear margin at the center and the edge

Generasi kadua[édit | sunting sumber]

Second-generation optical discs were for storing great amounts of data, including broadcast-quality digital video. Such discs usually are read with a visible-light laser (usually red); the shorter wavelength and greater numerical aperture[1] allow a narrower light beam, permitting smaller pits and lands in the disc. In the DVD format, this allows 4.7GB storage on a standard 12 cm, single-sided, single-layer disc; alternately, smaller media, such as the MiniDisc and the DataPlay formats, can have capacity comparable to that of the larger, standard compact 12 cm disc.

Generasi katilu[édit | sunting sumber]

Third-generation optical discs are in development, meant for distributing high-definition video and support greater data storage capacities, accomplished with short-wavelength visible-light lasers and greater numerical apertures. The Blu-ray disc uses blue-violet lasers of greater aperture, for use with discs with smaller pits and lands, thereby greater data storage capacity per layer.[1] In practice, the effective, multimedia presentation capacity is improved with enhanced video data compression codecs such as H.264, and VC-1.

Generasi satuluyna[édit | sunting sumber]

Format ieu aya sahareupeun cakram nu aya kiwari (generasi katilu), boga potensial leuwih ti sa-terabyte (1TB) rohangan panyimpen data.

Cakram optik nu bisa direkam jeung ditulisan[édit | sunting sumber]

Spésifikasi[édit | sunting sumber]

Gancang dasar (1×) jeung maksimum (kiwari) dumasar generasi
Generasi Dasar Maks
(Mbit/det) (Mbit/det) ×
Ka- (CD) 1.17 65.62 56×
Ka-2 (DVD) 10.55 210.94 20×
Ka-3 (BD) 36 432 12× [2]
Kapasitas jeung tata ngaran[3][4]
Tanda Sisi Lapisan
(total)
Gurat tengah Kapasitas
(cm) (GB) (GiB)
DVD-1 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 DS DL/SL 2 3 12 13.24 12.32
DVD-18 DS DL 2 4 12 17.08 15.90
DVD-R 1.0 SS SL 1 1 12 3.95 3.68
DVD-R 2.0 SS SL 1 1 12 4.70 4.37
DVD-R 2.0 DS SL 2 2 12 9.40 8.75
DVD-RW 2.0 SS SL 1 1 12 4.70 4.37
DVD-RW 2.0 DS SL 2 2 12 9.40 8.75
DVD+R 2.0 SS SL 1 1 12 4.70 4.37
DVD+R 2.0 DS SL 2 2 12 9.40 8.75
DVD+RW 2.0 SS SL 1 1 12 4.70 4.37
DVD+RW 2.0 DS SL 2 2 12 9.40 8.75
DVD-RAM 1.0 SS SL 1 1 12 2.58 2.40
DVD-RAM 1.0 DS SL 2 2 12 5.16 4.80
DVD-RAM 2.0 SS SL 1 1 12 4.70 4.37
DVD-RAM 2.0 DS SL 2 2 12 9.40 8.75
DVD-RAM 2.0 SS SL 1 1 8 1.46 1.36
DVD-RAM 2.0 DS SL 2 2 8 2.65 2.47
CD-ROM 74 min SS SL 1 1 12 0.682 0.635
CD-ROM 80 min SS SL 1 1 12 0.737 0.687
CD-ROM SS SL 1 1 8 0.194 0.180
DDCD-ROM SS SL 1 1 12 1.364 1.270
DDCD-ROM SS SL 1 1 8 0.387 0.360
HD DVD SS SL 1 1 8 4.70
HD DVD SS DL 1 2 8 9.40
HD DVD DS SL 2 2 8 9.40
HD DVD DS DL 2 4 8 18.80
HD DVD SS SL 1 1 12 15.00
HD DVD SS DL 1 2 12 30.00
HD DVD DS SL 2 2 12 30.00
HD DVD DS DL 2 4 12 60.00
HD DVD-RAM SS SL 1 1 12 20.00

Rujukan[édit | sunting sumber]

  1. a b Format War Update: Blu-ray Wins Over HD DVD
  2. "LG 6x Blu-ray Burner Available in Korea", CDRinfo.com.
  3. MPEG: DVD, Book A – Physical parameters
  4. DVD in Detail

Tumbu luar[édit | sunting sumber]

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