What is CD
Cd
is the most popular optical medium.it can hold 650 MB to 800mbof data. The data
on the cd cannot be erased like magnetic diskettes.
What is DVD
DVD
stand for (digital Video Disk).is an optical disk storage media format. its
main uses are video and data storage .DvD are of the same dimensions as compact
Cd. but storage more than six time as much data.
What is Blue Ray
Blue
ray disk (office abbreviation BD) is an optical disk storage medium designed to
supersede the DVD format .the standard physical medium is a 12 cm plastic
optical disk the same size as DVD and CDs. blue discs contain 25 GB per layer,
with dual layer discs and additional layer possible in the future.
Identification of DVD, CD, Blue Ray
Identification
|
CD
|
DVD
|
Blue Ray
|
Physical
view
|
Dimensions as compact
|
The same dimensions as compact Cd but thin
|
Physical medium is a 12 cm plastic optical
disk
|
Storage
|
650MB—800MB
|
4 GB----5 GB
|
25GB---50GB
|
Color
|
White
|
Silver
|
Blue
|
Speed
|
Low then DVD
|
Batter form cd and low then blue Rey
|
More faster and speed up than DVD
|
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