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SDK Starts Shipments of 2.5-Inch 334 GB HD Media

Showa Denko K.K.
September 8, 2009

Showa Denko K.K. (SDK) has started commercial shipments of 2.5-inch hard disk (HD) media with storage capacity of 334 gigabytes per disk, using the fifth-generation perpendicular magnetic recording (PMR) technology.

To the best of our knowledge, our new 2.5-inch HD media have the world’s highest storage capacity for this size available on the market today. SDK has already commercialized 1.89-, 2.5-, and 3.5-inch fourth-generation PMR media.

Demand for high-capacity HD media is growing for such applications as PCs that enable storage/editing of moving pictures as well as HDD recorders that can record high-definition TV programs. SDK has established a setup for ensuring speedy and stable deliveries of best-quality, high-capacity HD media based on the PMR technology. SDK is making preparations for timely commercialization of its fifth-generation PMR media in other sizes.

SDK is developing world-leading technologies for HD media with higher capacity. As the world’s largest independent HD media supplier, SDK will continue meeting customer requirements in terms of quality as well as quantity.


1. PMR technology

Compared with the conventional technology that stores magnetic data on a horizontal plane of the HD media, the PMR technology enables vertical magnetic recording, resulting in a dramatic increase in recording density.

2.The fourth- and fifth-generation PMR media

SDK's HD media based on the PMR technology are classified as shown in the table below according to respective storage capacities.

Generation 1.89-inch 2.5-inch 3.5-inch
1 40 80 160
2 60 120 250
3 80 160 334
4 120 250 500
5 (160) 334 (750)
(Unit: gigabytes per disk; as of September 8, 2009)

As for the products in parentheses, preparations are under way to start their commercial production.

For further information, contact:
IR & PR Office (Phone: 81-3-5470-3235)