1. CD-R (Compact Disk – Recordable) :
CD-R is a blank CD in which data can be stored once. After storing data it is converted into CD-ROM. It is made of a reflective metal disk with layer of green or opaque dye on top. It is cheaper as compared to CD-RW and CD-ROM also. In CD-R data can not be written over. The advantage with CD-R is that any version of CD players either it is older or newer it can easily read CD-R.
2. CD-RW (Compact Disk – ReWritable) :
CD-RW is a type of CD which can be erased and it can be used multiple times. It is made of a reflective metal disk with a layer of special metal on top. It is the most cheaper CD among all types. It is costly than both CD-R and CD-ROM. The disadvantage with CD-RW is that mostly older versions of CD players can not read it. In some properties it has some similarities too with CD-RW.
Difference between CD-R and CD-RW :
|It is made of reflective metal disk with layer of dye on top.||It is also made of reflective metal disk but it has special metal on top.|
|Data can be stored only once in CD-R.||Data can be stored multiple times in it.|
|It can not be erased.||It can be erased.|
|After storing data, it is converted into CD-ROM.||Even after storing data, it is CD-RW itself.|
|It is cheaper than CD-RW.||It is costly among all CD types.|
|Data can not be written over in CD-R.||Data can be changed after writing in it.|
|CD-R is more compatible.||CD-RW is less compatible.|
|It is effective for long term back-ups.||It is the best for data transferring.|
|All CD players i.e. older and newer can read CD-R.||Older CD players can not read CD-RW.|
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