Optical disc drives use removable media to store and retrieve data, typically 5.25”.
Types of optical discs include:
CD-ROM : Data CDs can typically hold 700 MB, can read and write at up to 52x (7.8 MB/s) and rewrite at up to 32x (4.8 MB/s).
DVD-ROM : DVDs have a capacity ranging from 4.7 GB (DVD-5) to 17 GB (DVD-18 dual-sided and dual-layered).
Recording technologies include DVD+R, DVD-R, DVD+RW and DVD-RW.
Blu-ray : Blu-rays are used for HD and games and have a capcity of 50 GB and a write speed between 1x and 12x (36 Mbps – 432 Mbs). Blu-ray drives connect via SATA only.
**Source by wikipedia**
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