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File:Comparison CD DVD HDDVD BD.svg

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English: Comparison of various characteristics of a Compact Disc, and single-layer Digital Versatile Disc, High-Definition/Density Digital Versatile Disc and Blu-ray Disc. Dimensions indicated are track pitch (p), pit width (w) and minimum length (l), and laser spot size (⌀) and wavelength (λ).

For comparison with analogue media, the pitch of the spiral of a 240-groove-per-inch long-playing record and a Laserdisc are 106 μm (66 times the CD track pitch) and 4.6 μm (2.9 times), respectively.[1] The tip of a 0.7-mil stylus has a diameter of 18 μm (11 times that of the CD laser spot).

Data is from [2], [3], [4] and [5]. The Airy disk profile is based on [6] with rings darkened by a factor of 5 for clarity.

Note that the wavelength is in vacuum or air; below the surface of the disc, the index of refraction of polycarbonate (n=1.585) means that the wavelength is only 63% of the listed values.
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Date/TimeThumbnailDimensionsUserComment
current19:07, 31 July 2018Thumbnail for version as of 19:07, 31 July 2018512 × 256 (19 KB)CmgleeUpdate SVG header as per http://commons.wikimedia.org/wiki/user_talk:cmglee#µ_symbol_not_png-ified_in_Comparison_CD_DVD_HDDVD_BD.svg and make background white.
19:41, 8 October 2012Thumbnail for version as of 19:41, 8 October 2012512 × 256 (19 KB)CmgleeImprove layout and colours.
23:01, 7 October 2012Thumbnail for version as of 23:01, 7 October 2012512 × 256 (18 KB)CmgleeReduce letter-spacing.
22:59, 7 October 2012Thumbnail for version as of 22:59, 7 October 2012512 × 256 (18 KB)Cmglee{{Information |Description ={{en|1=Comparison of various characteristics (track pitch p, pit width w, minimum pit length l, laser spot size ⌀ and laser wavelength λ) of a Compact Disc, Digital Versatile Disc, High-Definition/Density Digit...
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