?How Blu-ray Discs Work

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ره Blu-ray Disc 

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‎Discs‏ ی وب رن ‎Wises‏ ‎ 

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۷ ۱۳ ‏هت توت‎ vy Building a Blu-ray Disc yitow Blu-ray Reads Data y Blu-ray Competitors 

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Introduction to How Blu- ray Discs Work > — ingle-layer Blu-ray disc-27 GBdata ‘2h HDTV! 7shst. > RAdouble-Cayer Blu-ray disc-50GBi4¥.5AHDTVi2ohst. ae ne Set Cee eee ek ee a ee Oa ee aT eo ave es eo pas = 

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How Blu-ray Reads Data ۱ heen ‏ا‎ nes ca ae 5 2 ‎aaa ee aU eee nD‏ فا شم تیا ‎mechanism no disc tilt‏ ‎2 ‎Because the data is closer tothe surface,ahardcoatingisplaced on the outside of the disc to protect it fromscratchesand fingerprints. ‎27 ‏ومر ره یت همك ‏درس لس هک ۲ ‎=a‏ ۹ ‎ 

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Cost 2 DVDs -by injection molding the twoo0.6-mm discs recording layer between them! must be donevery carefully toprevent ۱ ‏ی‎ 181 ees Ua Te cee Me mC By Rae eT CN CURRENT gee oO -The twodiscsaregluedtogether. Blu-ray discs only do the injection-molding process ona single 7.7- mm disc! that savings balances out the cost of adding theprotective Cayer ! the endprice of BDis nomorethantheprice ofa regular ۷۰ Blu-ray discsare betterarmedthancurrent DVDs. They come equipped witha secureencryption system --auniquelD that protectsagainst video piracy andcopyright infringement. 

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Formats > DVDsandCDsstartedwithread-onlyformatsandonly Cater addedrecordableandre-writable formats, Blu-ray is ‏:15ه 01 تأناقت اك ]تك أسملتء 116411050 و اكع د ]ها س1‎ -BD-ROM (read-only) -for pre-recordedcontent -BD-R(recordable) -for PC data storage -BD-RW (rewritable) -for PC data storage 1۱ Aenea TO - ‏واقتك مع 311107 :جم‎ للكت سس 

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Blu-ray vs. DVD Capacity Single-layer DVD 4.7 GB of data average two-hour standard-definition movie with a few extra features Single-layer Blu-ray disc 27 GB of data more than 13 hours of standard video more than two hours of high-definition video Double-layer Blu-ray disc Lo dQ 0 10 20 30 40 50 ۱004 ۷۵۸۷۵۷۵ 

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DVD Vs. Blu-Ray Construction DVD BD 4.7 GB 25 GB Polycarbonate Layer minimum — minimum pitlength pit length ae 0.15um Recording Layer Optical Transmission 0 5-6 024 and Protection Layer an Laser 0-744m Blue wen Laser | ©2004 ۷۵۷/۹۵۷۵۸۵ 

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CD vs. DVD vs. Blu-ray Writing cD DVD BD 780-nm Red Laser 650-nm Red Laser 405-nm Bive Laser Lens Aperture = 0.45 Lens Aperture = 0.6 Lens Aperture = 0.8 Wo Ee One 1.2-mm Two 0.6-mm One ۱ polycarbonate ۳ polycarbonate layer track pitch track pitch track pitch = 1.6um = 74 = 30۳۳ (©2004 HowStuffWorks 

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Gave BO PADD 

How HowBlu-ray Blu-rayDiscs Discs Work Work by byDuša Dušan n Ristić Ristić  Introduction to How Blu-ray Discs Work  Building a Blu-ray Disc  How Blu-ray Reads Data  Blu-ray Competitors Introduction to How Bluray Discs Work  Şingle-layer Blu-ray disc- 27 GB data;2h HDTV; 13h st.  A double-layer Blu-ray disc- 50 GB;4.5h HDTV;20h st.  "blue,“- for the color of the laser ; “ray,“-for optical ray. The "e" in "blue“- left of because an everyday word cannot be trademarked. početna nazad slika Building a Blu-ray Disc  Laser “writes”-pits; laser reads-the bumps  A blue laser has a shorter wavelength (405 nanometers);  pits are only 0.15 µm; track pitch from 0.74 µm to 0.32 µm  BD thickness (1.2 millimeters) as a DVD;  Birefringence-data between two polycarbonate layers(o.6 mm) disc tilt- the disc can not be read početna nazad slika How Blu-ray Reads Data  data on top of a 1.1-mm-thick polycarbonate layer - no birefringence  recording layer sitting closer to the objective lens of the reading mechanism –no disc tilt  Because the data is closer to the surface, a hard coating is placed on the outside of the disc to protect it from scratches and fingerprints.  data transfer rate: BD - 36 Mbps ; DVD - 10 Mbps početna Nazad slika Cost  DVDs – by injection molding the two 0.6-mm discs recording layer between them; must be done very carefully to prevent birefringence.  BD: -The two discs are molded. -The recording layer is added to one of the discs. -The two discs are glued together.  Blu-ray discs only do the injection-molding process on a single 1.1mm disc; that savings balances out the cost of adding the protective layer; the end price of BD is no more than the price of a regular DVD.  Blu-ray discs are better armed than current DVDs. They come equipped with a secure encryption system -- a unique ID that protects against video piracy and copyright infringement. početna Nazad Formats  DVDs and CDs started with read-only formats and only later added recordable and re-writable formats, Blu-ray is initially designed in several different formats: -BD-ROM (read-only) - for pre-recorded content -BD-R (recordable) - for PC data storage -BD-RW (rewritable) - for PC data storage -BD-RE (rewritable) - for HDTV recording početna Nazad Blu-ray Competitors  JVC - Blu-ray/DVD combo disc - 33.5-GB  HD-DVD or AOD (Advanced Optical Disc), Toshiba and NEC; single-layer HDDVD-RW -15 GB; a double-layer -30 GB; a triple-layer -45 GB  Warner Bros. Pictures -HD-DVD-9 ; uses a higher compression rate to put more information on a standard DVD.  Taiwan -Forward Versatile Disc (FVD)- 5.4 GB- single-sided disc and 9.8 GB - doublesided disc  China - Enhanced Video Disc (EVD)  Sony -XDCAM and ProData (Professional Disc for Data).  Pioneer is developing an optical disc that will blow away the hard disc in most of our PCs; holding - 500 GB; Pioneer's lasers are ultraviolet, which have an even shorter wavelength than the blue. početna nazad slika See more Video That’s all folks !!!!!! Dušan Ristić II4 Presentation about Blu-ray Discs Exit Samsung BD P100