Editing Compact disc (section)

=== Disc shapes and diameters ===
[[File:Comparison disk storage.svg|thumb|upright=1.35|Comparison of several forms of disk storage showing tracks (not to scale); green denotes start and red denotes end.<br/><nowiki>*</nowiki> Some CD-R(W) and DVD-R(W)/DVD+R(W) recorders operate in ZCLV, CAA or CAV modes.]]

The digital data on a CD begins at the center of the disc and proceeds toward the edge, which allows adaptation to the different sizes available. Standard CDs are available in two sizes. By far, the most common is {{convert|120|mm}} in diameter, with a 74-, 80, 90, or 99-minute audio capacity and a 650, 700, 800, or 870&nbsp;MiB (737,280,000-byte) data capacity. Discs are {{convert|1.2|mm}} thick, with a {{convert|15|mm}} center hole. The size of the hole was chosen by Joop Sinjou and based on a Dutch 10-cent coin: a [[dubbeltje]].<ref>{{Cite web|title=Perfecting the Compact Disc System - The six Philips/Sony meetings - 1979-1980 |url=https://dutchaudioclassics.nl/The-six-meetings-Philips-Sony-1979-1980-The-Start-of-Digital-Audio/|access-date=2022-01-26|website=DutchAudioClassics.nl }}</ref> Philips/Sony patented the physical dimensions.<ref>{{Cite web |date=2015-06-25 |title=Response To Koninklijke Philips Electronics, N.V.'s, Sony Corporation of Japan's And Pioneer Electronic Corporation of Japan's Request For Business Review Letter |url=https://www.justice.gov/atr/response-koninklijke-philips-electronics-nvs-sony-corporation-japans-and-pioneer-electronic |access-date=2022-05-14 |website=justice.gov |language=en}}</ref>

The official Philips history says the capacity was specified by Sony executive [[Norio Ohga]] to be able to contain the entirety of [[Beethoven's Ninth Symphony]] on one disc.<ref name="Ohgaobituary"/> 
This is a myth<ref name="Imminknature">{{Cite journal|journal=Nature Electronics|volume=1|date=2018|title=How we made the compact disc
|author=K.A. Schouhamer Immink|author-link=Kees Schouhamer Immink
|url=https://www.researchgate.net/publication/324571504|access-date=2018-04-16
}}</ref> according to [[Kees Immink]], as the [[Eight-to-fourteen modulation|EFM]] code format had not yet been decided in December 1979, when the 120&nbsp;mm size was adopted. The adoption of EFM in June 1980 allowed 30 percent more playing time that would have resulted in 97 minutes for 120&nbsp;mm diameter or 74 minutes for a disc as small as {{convert|100|mm}}. Instead, the information density was lowered by 30 percent to keep the playing time at 74 minutes.<ref name="Immink2"/><ref>Tim Buthe and Walter Mattli, The New Global Rulers: The Privatization of Regulation in the World Economy, Princeton University Press, Feb. 2011.</ref> The 120&nbsp;mm diameter has been adopted by subsequent formats, including [[Super Audio CD]], [[DVD]], [[HD DVD]], and [[Blu-ray]] Disc. The {{convert|80|mm|adj=on}} diameter discs ("[[Mini CD]]s") can hold up to 24 minutes of music or 210&nbsp;MiB.

{| class="wikitable"
|-
! Physical size
! Audio capacity
! CD-ROM data capacity
! Definition
|-
| 120&nbsp;mm || 74–80 min || 650–700&nbsp;[[Megabyte|MB]] || Standard size
|-
| 80&nbsp;mm || 21–24 min || 185–210&nbsp;MB || Mini-CD size
|-
| 80×54&nbsp;mm&nbsp;– 80×64&nbsp;mm || ~6 min || 10–65&nbsp;MB || [[Business card]] size
|}