buzz – Network Interview https://networkinterview.com Online Networking Interview Preparations Fri, 20 Oct 2023 10:28:41 +0000 en-US hourly 1 https://wordpress.org/?v=6.8.1 https://networkinterview.com/wp-content/uploads/2019/03/cropped-Picture1-1-32x32.png buzz – Network Interview https://networkinterview.com 32 32 162715532 DVD vs BLUE-RAY DISC https://networkinterview.com/dvd-vs-blue-ray-disc/ https://networkinterview.com/dvd-vs-blue-ray-disc/#respond Fri, 11 Oct 2019 17:37:57 +0000 https://networkinterview.com/?p=12674 The DVD  technology was emerged in 1997. It revolutionized the movie industry and brought digital sound and video into homes all over the world.

The Blu-ray Discs (BD) were introduced in 2006. With their high storage capacity, these discs can hold and play back large quantities of high-definition video and audio, as well as photos, data and other digital content.

DVD vs BLUE-RAY DISC: COMPARISON TABLE

PARAMETER

DVD

BLUE-RAY DISC
STORAGE CAPACITY •Single layer DVDs(DVD-5s) can store about 4.7 GB.

•Double layer DVDs(DVD-9s) can store about 8.7 GB.

 •Single layer Blu-ray discs store approximately 25 GB.

•Double layer Blu-ray discs can store about 50 GB.
LASER TECHNOLOGY •Use a red laser of longer wavelength i.e. 650nm wave length to read DVD discs.

•Red lasers are wider in diameter and thus the reading is comparatively less precise.

 •Use a blue laser of shorter wavelength i.e. 405nm to read the stored information.

•Blue lasers are two and a half times smaller in diameter than red lasers and thus allows for closer and more precise reading of information.
DISC CONSTRUCTION Grooves on its underside are to be made wide enough to accommodate the larger wavelength.

(resulting in lesser storage)

 Grooves on a Blu-ray disc are much thinner and closer together because the blue laser used to read the disc has a shorter wave length.(resulting in almost 5 times more grooves and immense storage)
SCRATCH RESISTANCE It has a protective layer(0.6 mm) to resist scratching. It has a physically thinner(0.1 mm) layer, but with a hard coating that makes it more scratch resistant.
IMAGE RESOLUTION •Standard definition resolution of 480p

•Enhanced definition resolution of 520p

  High definition resolution of 1080p
DATA TRANSFER RATE •Data 11.08 Mbps

•Audio/Video 10.08 Mbps

 •Data 36.0 Mbps

•Audio/Video 54.0 Mbps
VIDEO RESOLUTION  720×480 (480i/480p-US) 1920×1080 (1080p)
AUDIO CODECS •Linear PCM

•Dolby Digital

•DTS Digital Surround

 •Linear PCM

•Dolby Digital

•DTS Digital Surround

•Dolby Digital Plus

•Dolby TrueHD

•DTS-HD
VIDEO CODECS •MPEG-2 •MPEG-2

•MPEG-4 AC

•SMPTE VC-1

Download the difference table here.

 

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