CD-ROM, CD-RW, and DVD Drives
Optical drives fall into two major categories:
Those based on CD technology, including CD-ROM, CD-R (recordable CD), and CD-RW (rewritable CD)
Those based on DVD technology, including DVD-ROM, DVD-RAM, DVD-R/RW, DVD+R/RW and DVD±R/RW
You should understand both read-only and recordable/rewritable CD and DVD standards to be prepared for the A+ Certification Exam and for your day-to-day work because these drives are found in virtually all recent computers.