Here are some friends with simlar question as we.And I have this question for many days,anyone help us?
Kitty said: Yes.What is the difference between cd and dvd?-I try seach this on internet but no results found.Maybe this is a stupid question.
Mike said: oh,no,you are wrong.I have found as below for this question(What is the difference between cd and dvd?),it will help you,my kids.
Answer:
On the outside CDs (Compact Disc) and DVDs (Digital Versatile Disc) look a like. So what makes a DVD hold more information than a CD? For one thing, DVDs store information more efficiently. A DVD laser generates a shorter wavelength beam than a CD. As a result, the DVD player can focus on a much smaller area. This means that the pit carrying the information can be smaller and that the pit spiral can be tighter.
A standard CD's storage is aprox. 650 Mb while the DVD standard size is 4.7 G in capacity. DVDs can also have double-sided and dual-layer discs which increases it's storage to 8 gigabytes of data.
cd dvd pit size
Specification CD DVD Comments
Diameter 12 cm (4.7") 12 cm (4.7") Same diameter
Thickness 12mm 12 mm (2x0.6) DVD's are made of two thin discs glued together
Total Capacity Aprox. 0.650 G bites (650 Mb) 1.4 - 8.0 Gigs DVDs have far more storage capacity
Rotation Speed 500(inner) to 200 (outer) rpm 1600 (inner) to 570 (outer) rpm DVDs spin 3 times faster than CDs
Data Storage: DVD vs. CD
DVDs can store more data than CDs for a few reasons:
* Higher-density data storage
* Less overhead, more area
* Multi-layer storage
Higher Density Data Storage
Single-sided, single-layer DVDs can store about seven times more data than CDs. A large part of this increase comes from the pits and tracks being smaller on DVDs.
Specification
CD
DVD
Track Pitch
1600 nanometers
740 nanometers
Minimum Pit Length
(single-layer DVD)
830 nanometers
400 nanometers
Minimum Pit Length
(double-layer DVD)
830 nanometers
440 nanometers
Let's try to get an idea of how much more data can be stored due to the physically tighter spacing of pits on a DVD. The track pitch on a DVD is 2.16 times smaller, and the minimum pit length for a single-layer DVD is 2.08 times smaller than on a CD. By multiplying these two numbers, we find that there is room for about 4.5 times as many pits on a DVD. So where does the rest of the increase come from?
Less Overhead, More Area
On a CD, there is a lot of extra information encoded on the disc to allow for error correction -- this information is really just a repetition of information that is already on the disc. The error correction scheme that a CD uses is quite old and inefficient compared to the method used on DVDs. The DVD format doesn't waste as much space on error correction, enabling it to store much more real information. Another way that DVDs achieve higher capacity is by encoding data onto a slightly larger area of the disc than is done on a CD.
Multi-Layer Storage
To increase the storage capacity even more, a DVD can have up to four layers, two on each side. The laser that reads the disc can actually focus on the second layer through the first layer. Here is a list of the capacities of different forms of DVDs:
Format
Capacity
Approx. Movie Time
Single-sided/single-layer
4.38 GB
2 hours
Single-sided/double-layer
7.95 GB
4 hours
Double-sided/single-layer
8.75 GB
4.5 hours
Double-sided/double-layer
15.9 GB
Over 8 hours
You may be wondering why the capacity of a DVD doesn't double when you add a whole second layer to the disc. This is because when a disc is made with two layers, the pits have to be a little longer, on both layers, than when a single layer is used. This helps to avoid interference between the layers, which would cause errors when the disc is played.
I've never cooked with either.
CD- you can only play music and view assorted files.
DVD - you can view and watch movies, listen to music. more on a higher version of all the CD's invented.
cd is straight sound vs. video and sound, kinda why the game systems could play both
cd is a single layer based disk approx 700mb storage data
can write up to 52 speed
hold approx i divx movie or 20 normal audio tracks or 180 mp3's
dvd is dual layer based and can hold up to 4.36gb of storage data can write upto 16 speed
can hold 1 dvd movie (better quality) 6 divx films or 1600 mp3's
i hope this helps
atb
CD - Compact Disc - Normal Data storage capacity upto 750MB
DVD - Digital Versatile Disc - Normal Data storage capacity upto 8.5GB
These are the basic differences. Will update the differences in detail.
I have a short answer cd has 1D while dvd has 2 D'S.
CD is a ram and DVD is cool water, CD and DVD is pizza and beer
CD in culinary terms/chef jargon means Cold Dish (French usually hors d'?uvre or HD); DVD never heard of in a kitchen...
cd's are made of chicken parts
and dvd's are made out of spam
Simple,
CD stands for Compatable Disk, and it is the device on which you save data on a single side only.
DVD stands for Digital Versatile Disk, and it works like a CD, but you can save on both sides, so logically, it has got more storage.
Well as you posted this in the food section then i'd say a dvd has more salt and a cd has more of a peppery taste!.....(or so i heard)!!!
DVD disks can hold many times the data that a CD can. CDs can hold around 650 megabytes (MB). DVDs can hold 4.7 gigabytes (GB) or about 4,700 MB. Put another way, DVD disks can hold about two hours of video. New technologies are pushing the capacities of DVD disks even further. Dual layer DVDs can hold roughly twice the data of a conventional single layer disk. Blu-ray disks, which are now being pushed by a number of manufacturers, can hold 27 GB in the single layer format and 50 GB in dual layer. A competing disk type, HD DVD, can hold around 15 GB. These newer standard DVD disks can only be used in drives designed to handle them.
http://www.swfpcug.org/faq/cd&dvd.htm#4...
Read this: All the information of cooking and health post by website user,chineseop.com not guarantee
correctness,It's Non-profit and only for informational purposes.
Kitty said: Yes.What is the difference between cd and dvd?-I try seach this on internet but no results found.Maybe this is a stupid question.
Mike said: oh,no,you are wrong.I have found as below for this question(What is the difference between cd and dvd?),it will help you,my kids.
Answer:
On the outside CDs (Compact Disc) and DVDs (Digital Versatile Disc) look a like. So what makes a DVD hold more information than a CD? For one thing, DVDs store information more efficiently. A DVD laser generates a shorter wavelength beam than a CD. As a result, the DVD player can focus on a much smaller area. This means that the pit carrying the information can be smaller and that the pit spiral can be tighter.
A standard CD's storage is aprox. 650 Mb while the DVD standard size is 4.7 G in capacity. DVDs can also have double-sided and dual-layer discs which increases it's storage to 8 gigabytes of data.
cd dvd pit size
Specification CD DVD Comments
Diameter 12 cm (4.7") 12 cm (4.7") Same diameter
Thickness 12mm 12 mm (2x0.6) DVD's are made of two thin discs glued together
Total Capacity Aprox. 0.650 G bites (650 Mb) 1.4 - 8.0 Gigs DVDs have far more storage capacity
Rotation Speed 500(inner) to 200 (outer) rpm 1600 (inner) to 570 (outer) rpm DVDs spin 3 times faster than CDs
Data Storage: DVD vs. CD
DVDs can store more data than CDs for a few reasons:
* Higher-density data storage
* Less overhead, more area
* Multi-layer storage
Higher Density Data Storage
Single-sided, single-layer DVDs can store about seven times more data than CDs. A large part of this increase comes from the pits and tracks being smaller on DVDs.
Specification
CD
DVD
Track Pitch
1600 nanometers
740 nanometers
Minimum Pit Length
(single-layer DVD)
830 nanometers
400 nanometers
Minimum Pit Length
(double-layer DVD)
830 nanometers
440 nanometers
Let's try to get an idea of how much more data can be stored due to the physically tighter spacing of pits on a DVD. The track pitch on a DVD is 2.16 times smaller, and the minimum pit length for a single-layer DVD is 2.08 times smaller than on a CD. By multiplying these two numbers, we find that there is room for about 4.5 times as many pits on a DVD. So where does the rest of the increase come from?
Less Overhead, More Area
On a CD, there is a lot of extra information encoded on the disc to allow for error correction -- this information is really just a repetition of information that is already on the disc. The error correction scheme that a CD uses is quite old and inefficient compared to the method used on DVDs. The DVD format doesn't waste as much space on error correction, enabling it to store much more real information. Another way that DVDs achieve higher capacity is by encoding data onto a slightly larger area of the disc than is done on a CD.
Multi-Layer Storage
To increase the storage capacity even more, a DVD can have up to four layers, two on each side. The laser that reads the disc can actually focus on the second layer through the first layer. Here is a list of the capacities of different forms of DVDs:
Format
Capacity
Approx. Movie Time
Single-sided/single-layer
4.38 GB
2 hours
Single-sided/double-layer
7.95 GB
4 hours
Double-sided/single-layer
8.75 GB
4.5 hours
Double-sided/double-layer
15.9 GB
Over 8 hours
You may be wondering why the capacity of a DVD doesn't double when you add a whole second layer to the disc. This is because when a disc is made with two layers, the pits have to be a little longer, on both layers, than when a single layer is used. This helps to avoid interference between the layers, which would cause errors when the disc is played.
I've never cooked with either.
CD- you can only play music and view assorted files.
DVD - you can view and watch movies, listen to music. more on a higher version of all the CD's invented.
cd is straight sound vs. video and sound, kinda why the game systems could play both
cd is a single layer based disk approx 700mb storage data
can write up to 52 speed
hold approx i divx movie or 20 normal audio tracks or 180 mp3's
dvd is dual layer based and can hold up to 4.36gb of storage data can write upto 16 speed
can hold 1 dvd movie (better quality) 6 divx films or 1600 mp3's
i hope this helps
atb
CD - Compact Disc - Normal Data storage capacity upto 750MB
DVD - Digital Versatile Disc - Normal Data storage capacity upto 8.5GB
These are the basic differences. Will update the differences in detail.
I have a short answer cd has 1D while dvd has 2 D'S.
CD is a ram and DVD is cool water, CD and DVD is pizza and beer
CD in culinary terms/chef jargon means Cold Dish (French usually hors d'?uvre or HD); DVD never heard of in a kitchen...
cd's are made of chicken parts
and dvd's are made out of spam
Simple,
CD stands for Compatable Disk, and it is the device on which you save data on a single side only.
DVD stands for Digital Versatile Disk, and it works like a CD, but you can save on both sides, so logically, it has got more storage.
Well as you posted this in the food section then i'd say a dvd has more salt and a cd has more of a peppery taste!.....(or so i heard)!!!
DVD disks can hold many times the data that a CD can. CDs can hold around 650 megabytes (MB). DVDs can hold 4.7 gigabytes (GB) or about 4,700 MB. Put another way, DVD disks can hold about two hours of video. New technologies are pushing the capacities of DVD disks even further. Dual layer DVDs can hold roughly twice the data of a conventional single layer disk. Blu-ray disks, which are now being pushed by a number of manufacturers, can hold 27 GB in the single layer format and 50 GB in dual layer. A competing disk type, HD DVD, can hold around 15 GB. These newer standard DVD disks can only be used in drives designed to handle them.
http://www.swfpcug.org/faq/cd&dvd.htm#4...
correctness,It's Non-profit and only for informational purposes.
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