A DUD discs generally suitable storage capacity is the actual number of
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Experts answer: There are two physical dimensions: 12cm (4.7 inches) and 8cm (3.1 inches) in thickness are 1.2mm, 0.6mm thick from the two primary bonded. This is consistent with the CD. DVD disc can be single or double. Each side can have one to two data layers . Disc capacity depends on the number of audio with video, and how video and audio compression. Often referred to in 133 minutes this figure is not true: there is only one channel of the DVD can store 160 minutes, if the compression quality and VCR rather then a DVD data layer can be kept Up nearly 9 hours of video and audio. In some cases, the average rate of 4.7Mbps (3.5Mbps for video, 1.2Mbps for three 5.1-channel soundtracks), a single-layer DVD can store slightly more than 2 hours content. a 2-hour movie, if there are three tracks The average data rate of 5.2Mbps. Double-layer DVD if the average data rate of 9.5Mbps (very close to the limit 10.08Mbps), also can store 2 hours of video. If the DVD-Video disc key data for the audio, and use the 48kHz * 16 -BitPCM (slightly better than CD quality), then will be able to store 13 hours of audio (on double layer disc can store 24 hours). If you use a 64kbps mono Dolby Digital, you can store 160 hours of audio (double-layer disc on can store 295 hours). DVD capacity: CD-ROM Can store 650 trillion bits of data, which is 0.64 gigabytes or 680 million bytes. In the following list, SS * DS * Double-sided that one side, SL * DL * ML said the mixed layer single * double * (mixed layer is a surface layer of the disc, the other side there are two layers), gig on Is a Gigabit (2 ^ 30), BB said gigabytes (10 ^ 9). See giga and billion7.2.DVD-5 (12cm, SS * SL) 4.38gig (4.7BB) data, more than 2 hours Video DVD-9 (12cm, SS * D L) 7.95gig (8.5BB), about 4 hours DVD-10 (12cm, DS * SL) 8.75gig (9.4BB), about 4.5 hours DVD-14 (12cm, DS * ML) 12.33gig (13.24BB), about 6.5 hours DVD-18 (12cm, DS * DL) 15.90gig (17BB), more than eight hours DVD-1 (8cm, SS * SL) 1.36gig (1.4BB), about a half-hour DVD-2 (8cm, SS * DL ) 2.48g ig (2.7BB), about 1.3 hours DVD-3 (8cm, DS * SL) 2.72gig (2.9BB), about 1.4 hours DVD-4 (8cm, DS * DL) 4.95gig (5.3BB), about 2.5 hours DVD -R1. gig (7.4BB); a small number of DS plate 8.75gigDVD-RAM1.0 (12cm, SS * SL) 2.40gig (2.58BB) DVD-RAM1.0 (12cm, DS * SL) 4.80gig (5.16BB) DVD 4BB) CD-ROM (12cm, SS * SL) 0.635gig (0.650BB) CD-ROM (8cm, SS * SL) 0.180gig (0.194BB) Note: the video store for an hour on average 2G bytes. DVD capacity than CD -ROM big reasons: 1) the length of the concave point smaller (~ 2.08x), 2) closely spaced data tracks (~ 2.16x), 3) slightly larger data area (~ 1.02x), 4) more effective channel bit modulation (~ 1.06x), 5) more efficient error correction (~ 1.3 2x), 6) less segment cost (~ 1.06x). All of these make a data layer of CD-ROM capacity of 7 times. Double disc capacity than twice the smaller single disc. Laser was "transparent off "to read out the data layer inside the data layer (a distance of 20 to 70 microns). In order to reduce interference between the two layers, two layers of the minimum length of the concave point increase from 0.4um 0.44um. To compensate, reference scanning speed slightly faster ** 3.84m * s, single disk for the 3.49m * s. longer concave, and mutual interval further, easy to read correctly, unexpectedly affected by the shaking. increase the length means that each circle concave points reduction, resulting in reduced capacity of each layer of data.
Experts answer: There are two physical dimensions: 12cm (4.7 inches) and 8cm (3.1 inches) in thickness are 1.2mm, 0.6mm thick from the two primary bonded. This is consistent with the CD. DVD disc can be single or double. Each side can have one to two data layers . Disc capacity depends on the number of audio with video, and how video and audio compression. Often referred to in 133 minutes this figure is not true: there is only one channel of the DVD can store 160 minutes, if the compression quality and VCR rather then a DVD data layer can be kept Up nearly 9 hours of video and audio. In some cases, the average rate of 4.7Mbps (3.5Mbps for video, 1.2Mbps for three 5.1-channel soundtracks), a single-layer DVD can store slightly more than 2 hours content. a 2-hour movie, if there are three tracks The average data rate of 5.2Mbps. Double-layer DVD if the average data rate of 9.5Mbps (very close to the limit 10.08Mbps), also can store 2 hours of video. If the DVD-Video disc key data for the audio, and use the 48kHz * 16 -BitPCM (slightly better than CD quality), then will be able to store 13 hours of audio (on double layer disc can store 24 hours). If you use a 64kbps mono Dolby Digital, you can store 160 hours of audio (double-layer disc on can store 295 hours). DVD capacity: CD-ROM Can store 650 trillion bits of data, which is 0.64 gigabytes or 680 million bytes. In the following list, SS * DS * Double-sided that one side, SL * DL * ML said the mixed layer single * double * (mixed layer is a surface layer of the disc, the other side there are two layers), gig on Is a Gigabit (2 ^ 30), BB said gigabytes (10 ^ 9). See giga and billion7.2.DVD-5 (12cm, SS * SL) 4.38gig (4.7BB) data, more than 2 hours Video DVD-9 (12cm, SS * D L) 7.95gig (8.5BB), about 4 hours DVD-10 (12cm, DS * SL) 8.75gig (9.4BB), about 4.5 hours DVD-14 (12cm, DS * ML) 12.33gig (13.24BB), about 6.5 hours DVD-18 (12cm, DS * DL) 15.90gig (17BB), more than eight hours DVD-1 (8cm, SS * SL) 1.36gig (1.4BB), about a half-hour DVD-2 (8cm, SS * DL ) 2.48g ig (2.7BB), about 1.3 hours DVD-3 (8cm, DS * SL) 2.72gig (2.9BB), about 1.4 hours DVD-4 (8cm, DS * DL) 4.95gig (5.3BB), about 2.5 hours DVD -R1. gig (7.4BB); a small number of DS plate 8.75gigDVD-RAM1.0 (12cm, SS * SL) 2.40gig (2.58BB) DVD-RAM1.0 (12cm, DS * SL) 4.80gig (5.16BB) DVD 4BB) CD-ROM (12cm, SS * SL) 0.635gig (0.650BB) CD-ROM (8cm, SS * SL) 0.180gig (0.194BB) Note: the video store for an hour on average 2G bytes. DVD capacity than CD -ROM big reasons: 1) the length of the concave point smaller (~ 2.08x), 2) closely spaced data tracks (~ 2.16x), 3) slightly larger data area (~ 1.02x), 4) more effective channel bit modulation (~ 1.06x), 5) more efficient error correction (~ 1.3 2x), 6) less segment cost (~ 1.06x). All of these make a data layer of CD-ROM capacity of 7 times. Double disc capacity than twice the smaller single disc. Laser was "transparent off "to read out the data layer inside the data layer (a distance of 20 to 70 microns). In order to reduce interference between the two layers, two layers of the minimum length of the concave point increase from 0.4um 0.44um. To compensate, reference scanning speed slightly faster ** 3.84m * s, single disk for the 3.49m * s. longer concave, and mutual interval further, easy to read correctly, unexpectedly affected by the shaking. increase the length means that each circle concave points reduction, resulting in reduced capacity of each layer of data.
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