File:Comparison CD DVD HDDVD BD.svg
Summary
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.<a rel="nofollow" class="external autonumber" href="http://www.mindspring.com/~laserguru/popsci.htm">[1]</a> 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 <a rel="nofollow" class="external autonumber" href="http://www.myce.com/review/pioneer-bdr-205-blu-ray-drive-review-22946/DVD-Blu-Ray-Reading-Performance-9/">[2]</a>, <a rel="nofollow" class="external autonumber" href="http://www.seminarpaper.com/2012/01/seminar-report-on-terabyte-disc-huge.html">[3]</a>, <a rel="nofollow" class="external autonumber" href="http://www.media.utah.edu/dvdworkshop/pdf/1F_DVD_vsCD.pdf">[4]</a> and <a rel="nofollow" class="external autonumber" href="http://www.hardwaresecrets.com/article/Blu-Ray-vs-HD-DVD/415/2">[5]</a>. The Airy disk profile is based on <a rel="nofollow" class="external autonumber" href="http://darekk.com/kalkulator/airy-disk-05.gif">[6]</a> 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/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 00:59, 4 January 2017 | | 512 × 256 (19 KB) | 127.0.0.1 (talk) | 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). <p>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.<a rel="nofollow" class="external autonumber" href="http://www.mindspring.com/~laserguru/popsci.htm">[1]</a> The tip of a 0.7-mil stylus has a diameter of 18 μm (11 times that of the CD laser spot). </p> <p>Data is from <a rel="nofollow" class="external autonumber" href="http://www.myce.com/review/pioneer-bdr-205-blu-ray-drive-review-22946/DVD-Blu-Ray-Reading-Performance-9/">[2]</a>, <a rel="nofollow" class="external autonumber" href="http://www.seminarpaper.com/2012/01/seminar-report-on-terabyte-disc-huge.html">[3]</a>, <a rel="nofollow" class="external autonumber" href="http://www.media.utah.edu/dvdworkshop/pdf/1F_DVD_vsCD.pdf">[4]</a> and <a rel="nofollow" class="external autonumber" href="http://www.hardwaresecrets.com/article/Blu-Ray-vs-HD-DVD/415/2">[5]</a>. The Airy disk profile is based on <a rel="nofollow" class="external autonumber" href="http://darekk.com/kalkulator/airy-disk-05.gif">[6]</a> with rings darkened by a factor of 5 for clarity. </p> 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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