I dont quite understand your grammar, a DVD-R can only be written once, and a DVD-RW can be written as many times as you wish.
a DVD plus r means ,dvd+r, it is a variant of common dvd, which can be written once . after it has been written, the data ot content can not be changed. if you want to change it, u need a dvd+rw, that means, u can write more than once
The DVD uses a red laser with a smaller wavelength, not the long wavelength red laser that is used for CDs. The shorter wavelength allows the beam to be more accurate. This accuracy means that more data can be stored on a DVD than a CD. Data can only be written on one side of a CD, but a DVD can be written on both sides depending on the type of DVD (for example, DVD-5) you have. For more information see the link below.
Dvd is better than CD because the dvd can store more data than the CD
A Blu-Ray DVD (50GB) holds more information than a DVD (4.7GB) which holds more information than a CD (700MB).
When does More than a game come out on dvd?
It should take no more than two DVD's to fit one movie on.
Honey is on DVD in more languages then English. This is a well known movie.
iTune
A DVD is more preferable than CD for its higher storage capacity than CD. Generally, a CD can hold up to 700 MB whereas a DVD can hold up to 4.7 GB. DVD is not only superior than CD in storage capacity, but also it is superior in requirement. It has been experienced that some system softwares require more than one CD or even one complete movie requires two or three CDs for storage. The use of DVD can overcome these problems as one DVD can be used to store the information of a number of CDs. A DVD requires a DVD combo drive or a DVD player which allows to read CDs as well as DVDs. Thus, a DVD is more preferable than a CD.
dvd has a larger memory and can put movie on
A DVD stores significantly more data than a CD can.
The DVD uses a different laser with a smaller wavelength, not the long wavelength red laser that is used for CD's. I believe the DVD laser is in the ultraviolet spectrum. Anywho, the smaller laser allows the DVD to have smaller "bumps" (which is what the laser reads). Since they are smaller, more can fit onto a disk. Also, DVD's can be 2-layer. Twice the data.