Most optical drives today are combo CD/DVD drives that support DVDs and all the CD formats: CD audio, CD-ROM, CD-R and CD-RW. The speeds of the drives are rated by their CD-ROM and DVD transfer rates.

At one time, Floppy drives, CDs, and DVDs were a primary source of external storage for many before USB storage devices took over. Nowadays, many devices do not even come with a built-in CD or DVD ...