Intelligent Blu-ray Disk Technology

Digital encoded audio & video information is stored on disks in form of pits. These pits are spiral grooves. These pits originate from the disk’s center and run through to its edges. Other side of pits is read by the help of laser in order to read and execute the program or movie which has been recorded on the DVD media disk.  The pits on the DVD disk have to be more closely packed and smaller in size to store more information. The reading laser has to be more precise in order to read data from the smaller pits. DVD media uses red-laser while blue-laser is used in the new Blu-ray media disc format. This is how the Blu-ray got its name because of the blue laser. Red laser has 650 nanometers wavelength. On the other hand the wavelength of blue laser is much shorter which 405 nanometers is. Smaller sized laser beam can focus more accurately and precisely.

The blue laser has the ability to read to read data from the pits that have size of 0.15 µm (microns). One micron is equivalent to 10-6 meters. The pits on the DVD disk are twice as bigger than that of the pits on Blu-ray media disc. Track pitch in the DVD disc is 0.74 microns which has been reduced to 0.32 microns in the Blu-ray media disk. The shorter track pitch, smaller laser beam and smaller pits, all these features assist the Blu-ray disk to record data of 25-GB on a single layer. Now the users have more luxury as the recording capacity of Blu-ray media disk is 5 times more than DVD disk.

The thickness of DVD and Blu-ray disk is same. The thickness of both disks is 1.2 millimeters. The data recording procedure is different for both disk types. DVD disc has 2 polycarbonate layers and the thickness of each layer is 0.6 mm. The information which is to be recorded on DVD disk is sandwiched between these 2 layers.

A layer on top of the recorded information can lead to birefringence. In birefringence, the laser light is refracted into 2 separate beams by the substrate layer. Data cannot be read from the DVD disk if the laser light splits too wide. Disk tilt is another problem that is caused if the surface of DVD disc is not totally flat or it is not precisely perpendicular to the laser the light. The laser beam distorts due to disk tilt. Very involved manufacturing procedure is required in DVD disk to avoid these problematic issues.

These problems have been solved in the Blu-ray disk format. In Blu-ray disk format, the data is recorded on top of polycarbonate layer whose thickness is 1.1 mm. This technique of Blu-ray overcomes birefringence. So as a result the readability problems are avoided in the Blu-ray disk format. In Blu-ray disc format, the objective lens and the recording layer are very closer to each other.

This closeness to the objective lens virtually eliminates the disk tilt problem which enhances the performance. The outer side of Blu-ray media disk is protected by a hard coating because the recorded information is very closer to the blu-ray disk’s surface. This hard coating feature makes the Blu-ray media unique, robust, efficient and more advantageous. The hard coating layer protects the Blu-ray disk surface from fingerprints and scratches. Therefore, the Blu-ray media disc is able to store information for longer time periods. Blu-ray media format is more reliable and robust.

Discount Electronics SAVE $100 - FREE Shipping - Toshiba Mini Netbook 1.66GHz 10.1" WSVGA $299 SAVE $100 - FREE Shipping - Toshiba Mini Netbook Intel Atom N280 1.66GHz 1GB DDR2 160GB HDD 10.1" WSVGA Win7 6-Cell $299 SAVE $110 - FREE Shipping - Gateway Desktop AMD Phenom X3 8550 2.2GHz $449 SAVE $110 - FREE Shipping - Gateway Desktop AMD Phenom X3 8550 2.2GHz 4GB DDR2 320GB HDD Win7 Premium 64-bit $449 SAVE $65 - FREE Shipping - Panasonic Blu-ray Player 1080p HDM I Cable Included $104 SAVE $65 - FREE Shipping - Panasonic DMPBD605 Blu-ray Player 1080p BD-Live Viera Cast SD Memory Card Slot USB HDM I Cable Included Refurbished $104 SAVE $250 - FREE Shipping - Sony VA IO Notebook Intel Core2Duo T6600 2.20GHz $899 SAVE $250 - FREE Shipping - Sony VA IO Notebook Intel Core2Duo T6600 2.20GHz 4GB DDR2 320GB HDD Blu-Ray Burner 16.4" Win7 Premium 64-bit $899.99 SAVE $980 - FREE Shipping - Samsung 55" ToC LCD HDTV 1080p 120Hz 4x HDM I $1819 SAVE $980 - FREE Shipping - Samsung 55" ToC LCD HDTV LN55B650 1080p 100000:1 DCR 120Hz 4x HDM I $1819.99 - after COUPON CODE: QWR1150 SAVE $219 - FREE Shipping - Samsung 40" ToC LCD HDTV 1080p 4x HDM I $729 SAVE $219 - FREE Shipping - Samsung 40" ToC LCD HDTV LN40B550 1080p 70000:1 DCR 4x HDM I $729 - after COUPON CODE: JQD1108 SAVE $630 - FREE Shipping - Samsung 40" ToC LCD HDTV 1080p 240hz $1169 SAVE $630 - FREE Shipping - Samsung 40" ToC LCD HDTV LN40B750 1080p 240hz 150000:1 DCR 2ms 4x HDM I PC input $1169.99 - after COUPON CODE: GZO1123 SAVE $129 - Kalorik Aqua Line Espresso Maker $69 SAVE $129 - Kalorik EXP20737 Aqua Line Espresso Maker 1250 Watts 15 Bar Pump Steam Frother $69 SAVE $120 - FREE Shipping - HP Mini Netbook 1.6GHz 10.1" LED $259 SAVE $120 - FREE Shipping - HP Mini Netbook - Intel Atom 1.6GHz 1GB DDR2 160GB HDD 10.1" LED XP Home refurbished $259.99 SAVE $20 - FREE Shipping - Gateway Notebook Intel Core 2.13GHz 17.3" $629 SAVE $20 - FREE Shipping - Gateway Notebook Intel Core i3 2.13GHz 4GB DDR3 320GB HDD 17.3" Win7 Premium 64-bit $629.99 SAVE $1149 - FREE Shipping - Samsung 52" ToC LCD HDTV 1080p 240hz $1549 SAVE $1149 - FREE Shipping - Samsung 52" ToC LCD HDTV LN52B750 1080p 240hz 150000:1 DCR 4x HDM I PC input $1549.99 - after COUPON CODE: MQC1135 SAVE $20 - FREE Shipping - Western Digital 750GB Hard Drive USB 2.0 $109 SAVE $20 - FREE Shipping - Western Digital 750GB My Passport Essential SE External Hard Drive USB 2.0 $109.99 after $20 Gift card w/ purchase SAVE $980 - FREE Shipping - Samsung 46" ToC LCD HDTV 1080p 240hz $1219 SAVE $980 - FREE Shipping - Samsung 46" ToC LCD HDTV LN46B750 1080p 240hz 150000:1 DCR 2ms 4x HDM I PC input $1219.99 - after COUPON CODE: LHC1126

Nice work if you can share it: an unemployment solution | Dean Baker - The Guardian Nice work if you can share it: an unemployment solution | Dean Baker The Guardian After 200-plus years of science & tech-stuff devoted to eliminating human labor, the jobs have gone. Robots & automation do that shit now. ... Milwaukee seeks federal money to lure Astronautics - Daily Reporter (blog) Daily Reporter (blog) Milwaukee seeks federal money to lure Astronautics Daily Reporter (blog) " I think they're important,"� Beitzel said, "because they hire a lot of inner-city people for jobs, and they combine that with some of the high-tech stuff. ... and more » Cloud Computing and the Approaching Philippine Election - SYS-CON Media (press release) SYS-CON Media (press release) Cloud Computing and the Approaching Philippine Election SYS-CON Media (press release) It's tough to remain focused on cool tech stuff in a hot country that still has tens of millions mired in the depths of poverty. ... and more » Sylvia's Story: An advocate for disability awareness in Michiana - WNDU-TV Sylvia's Story: An advocate for disability awareness in Michiana WNDU-TV "This is really high tech stuff. It has a computer component and it has a sensor in it."� It helps her get around visiting others with challenges. ...