What is Optical Storage? Types of Devices, Examples, Advantage, Disadvantage

What is Optical Storage? Types of Devices, Examples, Advantage, Disadvantage

Definition of Optical Storage

Definition – In the optical storage devices, all read and write activities are performed by light. All recording information stores at an optical disk. As per the opinions of data scientist that compact space is most useful for huge data storage. Their big advantages are not more costly, light weight, and easy to transport because it is removable device unlike hard drive.

Why to Use Optical Storage

In the optical storage devices, all data is saved like as patterns of dots which can be easily read with using of LIGHT. Laser Beam is used like as “Light Source”.

The data is read while bouncing laser beam on the surface of storage medium. Laser beam creates the all Dots while reading process, but it is used with high power mode to mark the surface of storage medium, and make a dot. This entire process is also called the “Burning” data onto Disc.

Types of Optical Storage Devices

There are various types of Optical Storage Devices, and below explain each one

types of optical storage devices

Examples of Optical Storage Devices


CD-ROM stands for “Compact Disc Read Only Memory”, and CD-ROM comes in the “Random Access” category’s devices. These types of disc can capable to store almost 800 MB of digital data. These data can’t discard by mistaken.


DVD-ROM stands for “Digital Versatile Disc – Read Only Memory”, and it also comes in the “Random Access” category’s devices. DVD-ROM discs can store data up to 4.7 GB, but Dual Layer DVD device’s storage capacity is double. These types of disc are used to store ultra quality video.

Blue Ray

Blue Ray discs are totally replaced by DVDs, because these discs are capable to hold data up to 25-50 GB, as well as double layer Blue Rays discs can store double data. Due to high storage capacity, Blue Ray discs are used to store HD (High Definition) videos.


HD DVD stands for “High Density DVD”, and these devices are capable to store data up to 15 GB (Dual Layer HD DVDS have storage capacity double). High-Density DVD discs are also used to hold HD Videos.


DVD-RAM stands for “DVD-Random Access Memory”, and it is able to Re-Write data. DVD-RAM are available in market like as floppy-disc style case. These types of discs have storage capacity of data similar to DVD (up to 4.7 GB).

DVD-RAM devices are used in several Camcorders such as “Video Recording Cameras”, and it can be used for data back-up and archiving.

Recordable Optical Devices

There are two types of discs such as “CD-R and DVD-R” and “CD-RW and DVD-RW”.


Full form of (CD-R & DVD-R) is “CD-Recordable and DVD Recordable”, and they are able to burn data on to them, but not easy to delete data. Users can add any type of data, but they can’t discard added data or re-use fully disc.


CD-RW & DVD-RW stands for “CD-Re Writable and DVD-Re Writable”, and they are capable to burn data similar (CD-R and DVD-R) onto them. Users can also delete and Re-Used data.

Advantages of Optical Storage Devices

  • It is capable to store vast amount of data.
  • Affordable price
  • It can be recycled (Re-used).
  • It has ultra data stability.
  • Countable/uncountable storage units
  • Best Durability, Transport-ability, and archiving.

Disadvantages Optical Storage Devices

  • Some traditional PCs are not able to read these disks.
  • It is getting trouble while recycling.


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