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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. 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 , , and .
Comparison of various optical storage media. This article compares the technical specifications of multiple high-definition formats, including HD DVD and Blu-ray Disc; two mutually incompatible, high-definition optical disc formats that, beginning in 2006, attempted to improve upon and eventually replace the DVD standard.
I think that a 'micro' (mu) prefix is missing from 3 measurements, the CD pitch and spot size, and the DVD track pitch. These are shown as 1.6, 1.6 and 1.1 *metres*. Other dimensions are correctly prefixed as millimeteres or nanometres. I also think the ' laser spot size (⌀) ' character (phi?) is not being shown.
DVD: Digital around 8.5 hours per layer (4.7 GB), with a maximum of two layers per side, which roughly equals 35 hours on a dual layered, two sided disc (can change due to compression). SACD: Digital Hybrid: A "Red Book" layer compatible with most legacy Compact Disc players, dubbed the "CD layer," and a 4.7 GB SACD layer, dubbed the "HD layer."
Print/export Download as PDF; ... CD, DVD: Linux: Free software ... Comparison of disc authoring software; Comparison of disk cloning software;
Print/export Download as PDF ... move to sidebar hide. This comparison of disc authoring software compares different optical disc ... CD-R /W 737MB=702MiB DVD-R /RW ...
Those 74 minutes come from the maximum playtime that the Red Book (audio CD standard) specifies for a digital audio CD (CD-DA); although now, most recordable CDs can hold 80 minutes worth of data. The DVD and Blu-ray discs hold a higher capacity of data, so reading or writing those discs in the same 74-minute time-frame requires a higher data ...
Some high-speed CD and DVD drives can use CAV. [specify] It allows for shorter access times because the rotation speed (angular velocity) does not need to be changed when the laser seeks across the disc, similarly to the magnetic head of a hard disk drive. With a given angular (rotation) speed, the linear speed at the outermost track is nearly ...