Difference between CD, DVD ,Pen Drive , Blu Ray disc in table
Answers
Answer:
Just as DVD meant a 5 to 10 times increase in storage capacity compared to CD, Blu-ray Disc will increase DVD capacity by 5 to 10 times. This is due, among other reasons, to the usage of a blue instead of a red laser and improved lens specifications, allowing for a much smaller focus laser beam which enables the recording of much smaller and higher density pits on the disc.
Parameters Blu-ray DVD
Storage capacity 25GB (single-layer) 4.7GB (single-layer)
50GB (dual-layer). 8.5GB (dual-layer)
Laser wavelength. 8.5GB (dual-layer) 650nm (red laser)
Numerical aperture (NA). 0.85 0.6
Disc diameter. 120mm 120mm
Disc thickness. 1.2mm 1.2mm
Protection layer
0.1mm
0.6mm
Hard coating
Yes
No
Track pitch
0.32µm
0.74µm
Data transfer rate (data)
36.0Mbps (1x)
11.08Mbps (1x)
Data transfer rate (video/audio)
54.0Mbps (1.5x)
10.08Mbps (<1x)
Video resolution (max)
1920×1080 (1080p)
720×480/720×576 (480i/576i)
Video bit rate (max)
40.0Mbps
9.8Mbps
Video codecs
MPEG-2
MPEG-2
MPEG-4 AVC
-
SMPTE VC-1
-
Audio codecs
Linear PCM
Linear PCM
Dolby Digital
Dolby Digital
Dolby Digital Plus
DTS Digital Surround
Dolby TrueHD
-
DTS Digital Surround
-
DTS-HD
-
Interactivity
BD-J
DVD-Video
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