What Is the Difference Between Blu-Ray and DVD?
It’s the age-old question. Do I go Blu-Ray or do I go DVD? While new technologies traditionally supplant old ones fairly quickly, Blu-Ray discs and DVDs seem to have been sitting side-by-side in the market together for some time. So, what’s the difference between Blu-Ray video and HD DVD videos? What are the pros and cons of each, and is one better than the other?
Fortunately, on this issue, there is actually no debate. It may surprise some DVD fans to learn that Blu-Ray is unequivocally better on pretty much every level. Let’s break it down.
Blu-Ray discs have more storage capacity — a LOT more. A standard DVD holds 4.7 gigabytes of data. This is enough to hold one movie. If that movie is longer than two hours, you need two DVDs or a double-layer DVD that can store around 9GB. On the other hand, a double-layer Blu-ray disc can hold a massive 50 GB of data.
Image resolution just means how your picture looks when you are viewing the disc, which is usually all people really care about. When looking at the DVD vs. Blu Ray resolution, Blu-Ray easily wins this battle, too. A DVD is a standard definition device. You won’t get high-definition movie viewing on your DVD, just 480 SD. On the other hand, Blu-Ray is made for HD, and you’ll get the best picture possible, with 1080 HD capability for your Blu-Ray movies. So if you are looking for a quality picture, Blue Ray is the clear winner.
Both DVD and Blu-Ray players use lasers to read the discs. The difference is that the DVD laser is a red laser that works at a 650nm wavelength. The Blu-Ray laser is — you guessed it — blue and works on shorter 405nm wavelengths, meaning they can read information more closely and precisely.
DVDs and Blu-ray discs look the same to the naked eye, but the Blu-Ray’s grooves are much closer together and thinner since the blue laser can read more precise data. This is what enables the Blu-Ray disc to store so much more information. Blu-ray discs are also more scratch-resistant than DVDs.
The Case for DVDs
So, is it time to throw out all your DVDs and replace them? Maybe not quite yet. If you are wondering can a Blu-Ray player play a DVD – It can! All Blu-Ray players can read and play DVDs, so you don’t have to if you don’t want to buy the same movie twice. If, however, you do not have a Blu-Ray player, you won’t be able to play Blu-Rays. The DVD laser is too big to read a Blu-Ray disc.
Secondly, DVDs are currently cheaper than Blu-Rays, so if you’re not looking to spend the extra money and don’t care that much about picture quality, you can still buy DVDs. You also may not be able to find the movie