| dbo:abstract |
DDCD (anglicky Double Density Compact Disc – kompaktní disk se zdvojenou hustotou) je speciální formát CD-ROM/RW/R, které má menší vzdálenost stop od sebe. Tuto technologii představily firmy Sony a Philips v roce 2000. Byl to však jen další neúspěšný pokus o rozšíření starší technologie. (cs) The double-density compact disc (DDCD) is an optical disc technology developed by Sony using the same laser wavelength as a compact disc, namely 780 nm. The format is defined by the Purple Book standard document. Unlike the compact-disc technology it is based on, DDCD was designed exclusively for data with no audio capabilities. For a 12 cm disc, it doubles the original 650 MB to 1.3 GB capacity of a CD on recordable (DDCD-R) and rewritable (DDCD-RW) discs by narrowing the track pitch from 1.6 to 1.1 micrometers, and shortening the minimum pit length from 0.833 to 0.623 micrometers. The DDCD was also available in read-only format (DDCD-ROM). The specification allowed for both 12 cm and 8 cm discs, although it appears no 8 cm media was ever released. The technology, released years after rewritable DVD technology, failed to acquire significant market share. The only DDCD recorder introduced was the . While the initial launch price of the drive and the disc ($249 and 2−3respectively)waslowerthanthepricesofDVD−RWdrivesandmedia(2-3 respectively) was lower than the prices of DVD-RW drives and media (2−3respectively)waslowerthanthepricesofDVD−RWdrivesandmedia(1000 and $10 respectively), an 85% increase in storage compared to the standard 700 MB CDs was not enough to entice customers. A similar technology, however, was used in the GD-ROM discs primarily used for Sega Dreamcast software. DVD offered a significantly higher capacity - nearly four times more than DDCD-R with 4.7 GB on single layer discs and six and a half times more with 8.5 GB on double layer discs and would drop significantly in cost in the years after DDCD's launch. The DDCD technology was marked as 'legacy' in the 2006-edition of the SCSI Multimedia Commands set (MMC). (en) DDCD（Double Density CD）は、一般的なCDの2倍に当たる1.3GBの容量を持つCDのことである。規格書はである。 (ja) 雙倍密度CD（Double Density Compact Disc, DDCD）是一項由Sony開發的光碟科技，使用與CD相同的雷射波長，即780奈米。這個格式描述於彩虹書中的規格文件中。 它的直徑與CD相同為120公釐，但容量從650MB增大至1.3GB。因為它將原本的1.6微米的軌距縮小至1.1微米，並且把坑洞的最小長度從0.833微米縮小至0.623微米。它有三種格式：一般的DDCD-ROM、可燒錄的DDCD-R、可複寫的DDCD-RW。這三種格式也可應用在直徑80公釐的小光碟形式上。 這項科技未能在DVD格式流行之前佔有足夠的市場份額，所以在面對DVD優秀的容量能力時，DDCD迅速的消失於市場上。 唯一曾出現在市場上的DDCD燒錄器是。 在2006年版的（SCSI Multimedia Commands）中，這項技術被標為「legacy」。 (zh) |
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http://www.dpreview.com/articles/5586166218/sonyddcddrive http://pc.watch.impress.co.jp/docs/article/20001018/wpe07.htm http://www.sony.net/SonyInfo/News/Press_Archive/200007/00-0705/ |
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| rdfs:comment |
DDCD (anglicky Double Density Compact Disc – kompaktní disk se zdvojenou hustotou) je speciální formát CD-ROM/RW/R, které má menší vzdálenost stop od sebe. Tuto technologii představily firmy Sony a Philips v roce 2000. Byl to však jen další neúspěšný pokus o rozšíření starší technologie. (cs) DDCD（Double Density CD）は、一般的なCDの2倍に当たる1.3GBの容量を持つCDのことである。規格書はである。 (ja) 雙倍密度CD（Double Density Compact Disc, DDCD）是一項由Sony開發的光碟科技，使用與CD相同的雷射波長，即780奈米。這個格式描述於彩虹書中的規格文件中。 它的直徑與CD相同為120公釐，但容量從650MB增大至1.3GB。因為它將原本的1.6微米的軌距縮小至1.1微米，並且把坑洞的最小長度從0.833微米縮小至0.623微米。它有三種格式：一般的DDCD-ROM、可燒錄的DDCD-R、可複寫的DDCD-RW。這三種格式也可應用在直徑80公釐的小光碟形式上。 這項科技未能在DVD格式流行之前佔有足夠的市場份額，所以在面對DVD優秀的容量能力時，DDCD迅速的消失於市場上。 唯一曾出現在市場上的DDCD燒錄器是。 在2006年版的（SCSI Multimedia Commands）中，這項技術被標為「legacy」。 (zh) The double-density compact disc (DDCD) is an optical disc technology developed by Sony using the same laser wavelength as a compact disc, namely 780 nm. The format is defined by the Purple Book standard document. Unlike the compact-disc technology it is based on, DDCD was designed exclusively for data with no audio capabilities. The DDCD technology was marked as 'legacy' in the 2006-edition of the SCSI Multimedia Commands set (MMC). (en) |
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DDCD (cs) Double-density compact disc (en) DDCD (ja) DDCD (zh) |
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