Compact Disc-Read Only Memory (CD-ROM) is a type of optical disk capable of storing certain amounts of data – up to 1GB (gigabyte) – although the most common size is 650MB (megabytes). A single CD-ROM has the storage capacity of 700 floppy disks with enough memory to store about 300,000 text pages.
Digital Versatile Disc or Digital Video Disc (DVD) is a type of optical disk technology similar to the CD-ROM. A DVD holds a minimum of 4.7GB of data with enough memory for a full-length movie. DVDs are commonly used as a medium for digital representation of movies and other multimedia presentations that combine sound with graphics.
CD-R stands for CD-Recordable; DVD-R stands for DVD-Recordable. With CD-R/DVD-R, data can be recorded once, after which the disc becomes read-only. Use only CD-R/DVD-R discs for CD or DVD duplication intended for storing temporary records. These discs provide protection for your records against tampering or loss of data.
CD-RW/DVD-RW stands for CD-Rewritable or DVD-Rewritable. Rewritable media are not appropriate for CD or DVD duplication for e-records storage or retention. RW discs can be written to multiple times. The film layer on RW discs degrades at a faster rate than the dye used in CD-R/DVD-R discs, especially with frequent recording and rewriting. Many different data formats can be copied to optical disc; however, only specific formats can be read or played back on specific machines. The mastering technicians at Diskcopy can assist you in choosing the correct format for your playback device.