Various kinds of discs before and after the CD R
CD R is a technology that allows you to store around 800 MB of information without much risk of incompatibility with most gadgets that support the technology. This is stored on a very sleek looking plastic disc that has a film of reflexive coating whose ups and downs on the surface allow for the information to be written on by the rays of the laser light. This same technology has been used today in a more multi-dimensional way with different important changes that allows the information to be written to a greater extent, allowing for the production of DVDs and more recently, BluRay DVDs.
However, in the CD Rs, along with the aforementioned default layers that were used for the regular Audio CDs, there is a polymer dye between the two layers of metal and the plastic that serves as the storage surface. This allows for the laser light to store information on it when in the burning mode. The modern CDs from then on have the ability to be written in multi sessions. This means that you can write one full CD in various sessions of your choosing. However, the CD R is still writable only once, although it can be read multiple times. Thus, even in the multisession, you will not be able to delete once used up space and write information on that again. You will have to make use of the empty spaces.
Yet, to provide more flexibility, we have CD RW which simply means COMPACT DISC RE-WRITABLE. This is costlier than CD R though.
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