Once CD's have data put on them, it cannot be erased. On rewritable CD's, the reflective layer on the bottom of the disc is a different compound that, when hit by the CD drive's laser at increased power, will melt, erasing data so something else can be written in its place.
it can be used to write rewritable cd's
No, only CD-RWs are rewritable.
Data can be copied to CDs (Compact Discs) which are writable/rewritable and need a CD/DVD burner to write data. The difference between a floppy and CD is that floppy is a magnetics media and CD an optical media (read/write happens with help of a laser light). - Neeraj Sharma
A CD-RW drive is able to Read CDs, VCDs, and write CD-R and CD-RW.
You can store files on CD-RW and also CD-R. Flash drives are a little better though.
CD-R isn't rewritable at all. A CD-RW can be rewritten on.
A burned CD into a blank disc by erasing it using a CD-RW drive and the appropriate software. This only applies to rewritable CDs.
A DVD RW drive will read any sort of CD or DVD (except blue-ray but some might) and it will also burn to a writable or rewritable CD or DVD.
Any discs that have "RW" on them. An example "CDRW" - Compact Disc, ReWritable
Usually that information is on the face of the CD itself along with the brand name. It will have CD-RW or CD+RW. The plus or minus signs indicate what type of re-writable the CD is. If the face of the CD is blank, look at the clear area around the center hole. The information should be stamped there.
CD-RW.