Optical Storage Device

An optical storage device is a type of computer data storage. It uses light to read and write data rather than electricity, magnetism, or electro-optical technology. These also provide more power efficiency per unit volume than magnetic tape. Many optical disc drives are designed to read CD-ROM and recordable Blu-ray discs. When used to read from optical discs, an optical drive is commonly called a “CD drive,” “DVD drive,” or “DVD and CD-R drive,” depending on the type of disc. These are widely used for software applications and computer games, as they can be used to play Blu-ray discs and standard DVDs.

About Optical Storage Device:

If you’ve ever faced the difficulty of finding space on your computer for all of your photos or files, you’ll understand what a challenge hard drives can be. But fortunately, there are many great optical storage devices to help. 

• CD-ROMs are best used for data archiving due to their lower storage capacity.

•  Blu-Ray Discs are best used for data archiving and storage due to their storage capacity.

• DVDs are best used for data archiving due to their lower cost.

• CD-R is best used for data archiving or file backups due to its lower cost.

• CD-RW is best used for data archiving or file backups due to its lower cost.

• DVD+R is good at storing large files but suffers from disc rot if not properly cared for after recording.

Blu-Ray Discs share the same advantages as CDs and DVDs in that they are good for data archiving and storage. Although Blu-Ray Discs have a much higher storage capacity, the speed of your computer may not be able to handle their fast read/write speeds.

Storage capacity of Optical storage device:

A CD-ROM has a maximum capacity of 650MB, while double-sided DVDs can store up to 700GB of data. For example, the smallest PMP format optical disc is 2.5GB in size – double-sided and single layer (two discs joined together).

Structure and design of Optical Storage Device:

An optical disc comprises a plastic disc with a thin, reflective layer. On top of the reflective layer is a protective plastic coating. Then, on top of the plastic coating is an aluminium layer that protects against scratching or other damage. Finally, on top of the aluminium layer is another protective coating that protects against infra-red (IR) light. On the side are a series of ridges called tracks. The tracks are used to store data and as a method of reading and writing data. The standard ISO9660 format uses a 1.2 mm wide track with a pitch of 0.74 mm.

Types of  Optical Storage Device:

The Optical storage device types available in the market are

1) CD-ROM (Compact Disc Read-Only Memory) 

2) DVD (Digital Versatile Disc) 

3) Blu-ray Disc (BD-ROM, BD-R, BD-RE) 

4) HD DVD (High Definition Disc Read-Only Memory – Part of a redefined DVD format not including optical layer and already obsolete since 2006 )

Application of Optical Storage Device:

The Optical storage device is widely used in data storing media.

In computers:

A computer can store large amounts of data on an optical disc. The advantage of using optical discs is that they are more cost-effective than magnetic disks. An optical disc can store more information than a hard disk.

In Audio Players: 

Every kind of audio player, such as CD Players, MP3 Players, etc., uses an optical disc to store the data. Using this type of storage is lightweight and provides a large storage capacity.

In Digital Cameras: 

Digital cameras usually use the optical disc for storing images and videos. The advantage of using this type of storage is that it provides a large storage capacity and offers high-speed data transfer.

In Memory Card: 

Advantages and disadvantages of Optical Storage Device:

The advantages of using optical storage are that:

• It provides a lot of storage capacity. One CD-ROM can be used as 100 times the normal hard disk drive.

• It provides high-speed data transfer, which is much faster than the traditional hard disk drives. They are also lightweight and can be transported easily, unlike HDDs which need a big space to carry them.

The disadvantage of using this type of storage is:

• They are easily broken if used without care. 

• They are expensive to manufacture and use more power than magnetic drives.

Conclusion: 

The optical storage device has many advantages over traditional magnetic storage, and high-density optical storage is applicable in many areas of our daily life. In an attempt to create a smaller, more powerful disc, the Blu-ray Disc format was developed. However, the adoption of BD technology has not matured as hoped. Even though BD technology uses a layer of red laser light rather than blue light like CD-ROMs use, it has always been regarded as less efficient than CD-ROM. And with the increasing usage of HDTV sets, the optical storage device is deteriorating in favour of the magnetic hard drive.