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Toshiba develops a 36GB blue laser rewritable disk

Posted: 13 May 2003 ?? ?Print Version ?Bookmark and Share

Keywords:toshiba? blu ray disck? blue laser? rewritable disk? advanced optical disk?

Toshiba Corp. has developed a dual layer 36GB rewritable disk for the Advanced Optical Disk (AOD) system. The dual-layer disk is an effort to realize a 40GB capacity on each side using technologies similar to that of DVD.

The AOD system uses an objective lens with a numerical aperture of 0.65 and the same disk structure as DVD disks (two 0.6mm thick platters bonded together). The competitive Blue-ray Disk format uses a lens with a numerical aperture of 0.85 and a disk with a 0.1mm cover layer, which makes the format incompatible with the DVD format.

The AOD disk is a phase-change disk whose recording layers are made of a germanium-tellurium rich germanium-antimony-tellurium-bismuth alloy. The capacity target is 40GB.

Sony Corp. introduced the first Blu-ray Disk recorder just last month, which used a single-layered 23GB disk. For its part, Matsushita demonstrated a Blu-Ray dual-layer disk with 50GB capacity in 2001.

- Yoshiko Hara

EE Times

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