Iranian Nanotechnology Firm Produces High-Quality DVDs

Zarin Moj company used the advantages of nanotechnology to produce recordable compact discs (120 mm CD-R) with a capacity of 700 MB and digital multi-purpose disc (120 mm DVD) with a capacity of 9 GB.

These discs have a nanometer coating with a thickness of less than 100 nanometers.

"All production steps should be taken with high precision and at the nano level. Applying a nanometer coating by using the sputtering method on the CD surface improves the performance of this product,” said Mohammad Reza Mashallahi, the managing-director of Zarrin Moj company.

“Also reducing the thickness of the cover on the surface of the disc has resulted in reduction of its price,” he added.

The industrial company has also started to produce DVD frames and HD-DVD frames for the first time in the Middle East.

Nanocoating is an ultra-thin layer or a chemical structure that is built upon surfaces by a variety of methods. Typically, nanocoating is used to impart a particular chemical or physical function to a surface.

The use of nanocoating improves the quality of the product.

Compact disks (CDs) and DVDs are used in data storage, in which the information is stored by means of a laser and creating small holes in the spiral tracks on its surface.

The data is coded as zeros and ones (binary) on the disk and read by a weaker laser and an electric eye (photocell) in optical disk drives.

There are different types of discs, including CD, DVD, and DVD9, which are categorized based on the storage capacity for data.

These disks are similar to each other in dimension, and the production process and the type of materials used are almost the same.

A DVD is usually made of four layers and has a thickness of 1.2 mm. In order to increase the storage capacity of DVDs, various methods are used.

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