Blu-Ray vs. DVD – What’s The Difference

The major difference between Blu-ray and DVD is storage capacity and image resolution. Due to the availability of huge options, it is a bit confusing to choose which is right for you. Blu-ray and DVD are both storage devices which store a specific amount of data.

Key Differences 

Storage Capacity: Blu-ray has a lot more storage capacity as compared to DVD. A standard DVD can store 4.7 GB of data, while Blu-ray can store data of 25GB.


Image Resolution: Image resolution means how much detail an image holds or how it appears. The image resolution of Blu-ray is much better than DVD. As compared to DVD, Blu-ray provides much better picture quality.

These are the very basic and main differences between DVD and Blu-ray; further details are discussed down below.


What is Blu-ray?

Blu-Ray vs. DVD

Blu-ray is an optical disc and storage device used to store high-definition videos and data.

Blu-ray name is originated by combining blue and optical “ray” because it uses blue-violet laser instead of red laser, unlike other storage devices. It has greater storage space as compared to any other optical storage device. Unlike previous storage devices, it can store high-definition videos. As blue-violet has a shorter wavelength than red rays, it can store more information in small space.

Blue-ray is 120 millimeters in diameter and 1.2 millimeters in thickness and has the same size as DVD and CD.

Single-layer Blu-ray can store 25GB of data, while dual-layer Blu-ray can store 50GB of data.

Blu-ray gained extreme market dominance as compared to other storage devices. Due to the lesser gap between the disk data layer on the disk, laser can store an enormous amount of data.

There are three versions of Blu-ray available:

  • Read-only BD-ROM
  • Recordable once BD-R
  • Recordable BD-RE

Advantages of Blu-ray

  • It has a huge storage capacity.
  • It ensures backward compatibility.
  • It provides durable HDTV support.
  • It provides high-resolution pictures and plays HD videos.

Disadvantages of Blu-ray

  • It has a quite high cost.
  • The DVD player cannot play Blu-ray.
  • It can store high-quality videos but only in limited ways.

What is DVD?

Blu-Ray vs. DVD

It’s the optical device used to store data, especially photographs, videos, music, and movies.

DVD stands for Digital Versatile Disk. It was a replacement for VHS and CD-ROM. Unlike Blu-ray, red laser is used in DVD. Due to the large wavelength of red rays, it has a larger area to focus, but it stores less data than blue laser.

Single-layer DVD storage is 4.7 GB, while dual-layer has a maximum storage of 7.4 GB.

It provides improvement over VHS tapes by providing high-quality videos, storage, and other features. It has a better quality picture as compared to CD and VHS.

Advantages of DVD

  • It provides high density than a CD.
  • It is cost-effective than Blu-ray.
  • It is much more durable.

Disadvantages of DVD

  • It has a slow data transfer speed as compared to Blu-ray.
  • It has less storage capacity.
  • It cannot store HD videos.

Comparison Chart Between DVD And Blu-Ray

Basis for Comparison Blu-ray DVD
basics Used to store digital data of high quality and HD videos. Used to any type of data, including videos, music, pictures.
Storage capacity(single layer) The single-layer storage capacity is 25 GB. The single-layer storage capacity is 4.7 GB.
Storage capacity(dual-layer) Dual-layer storage capacity is 50 GB. Dual-layer storage capacity is 7.4 GB.
Type of laser It has a blue-violet laser. It has a red laser.
Data security It has high data security. It has low data security.
Cost It is a bit costly. Its cost is less than Blu-ray.
Video quality Due to its large storage, it can contain HD videos. Due to the small storage capacity, it only has SD videos.
Laser wavelength The wavelength of Blu-ray laser is 405nm. The wavelength of the DVD laser is 650nm.
Protection layer The protection layer of Blu-ray is 0.1mm The protection layer of the DVD is 0.6mm
Coating It has contained a hard coating It does not contain any  hard coating
Location of the metal layer In the case of Blu-ray, the metal layer is present near to the mechanism’s objective lenses. But in the case of DVD metal layer or layer of recording is present in the middle of the disk.
Spacing between spiral loops Blu-ray has 0.30 micrometers space between spiral loops. While DVD has 0.74 micrometer spacing between spiral loops.
Correction code Pickets codes are the correction code of Blu-ray RS-PS and EFMplus are correction codes of DVD
Data transfer rate The data transfer rate of Blue-ray is 36Mbps. The data transfer rate of DVD is 11.08Mbps.
Spacing between the pits Blu-ray has 0.15 micrometers spacing between the pits. While DVD has 0.4 micrometer spacing between the pits.
Availability of movies 3-D movies are also available on Blu-ray. 3-D movies are not available on DVD.


From the above discussion, it is clear that as compared to DVD, Blu-ray has high storage capacity, store HD videos, provide high security and compatibility. But in many aspects, a DVD is better than Blu-ray. If you don’t care about the picture quality and want to save money, a DVD is better. Moreover, Blu-ray cannot be played on a DVD player. It requires Blu-ray players, so this is also another fact that should be considered.

About James Smith

A freelance writer specializing in business, finance, and technology. He has studied these subjects and spends a lot of time developing content to assist explain complex content for the average individual.

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