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索尼公司推出了一种直径12厘米,容量为20GB的可重写光学盘片原型。盘片上两个记录轨凹坑之间距离为0.3微米。同一轨上两个凹坑之间的距离为0.135微米,平面密度为每平方英寸15.9Gb。目前索尼公司寻求开发一种记录每面容量超过20GB的盘片用于记录HDTV的画面数据。
Sony introduced a prototype rewritable optical disc with a diameter of 12 cm and a capacity of 20 GB. The distance between two tracks on the disk is 0.3 microns. The distance between two pits on the same track is 0.135 microns and the plane density is 15.9Gb per square inch. Sony is currently seeking to develop a record of more than 20GB capacity per side of the disk for recording HDTV screen data.