Distinguish different types of DVDs in the market

The majority of DVD users today only have the concept that this type of optical disc has a large capacity compared to regular CDs and gives high quality images. However, few people pay attention to the symbols that come with the DVD, making this disc does not fully utilize its features. Here are some common DVDs.

Currently, DVD is divided into two main categories: single layer DVD - has a capacity of 4.7 GB and double DVD layer - has a capacity of 4.7 GB x 2 = 9.4 GB. If the DVD player does not have a double layer symbol, it will not be able to read this format.

DVD ± R (DVD recordable) : DVD discs can only be recorded once. DVD-R: The format first appeared and originally intended to save the image. DVD + R: same as -R but allows viewing without a complete disc.

DVD ± RW (DVD Read Write) : DVD is capable of erasing and writing multiple times. Usually a DVD ± RW disc is capable of recording, erasing no less than 1,000 times. The capacity of this type of disc is 4.7GB. DVD + RW discs are often used for storage, while DVD-RW is often used until recording. Currently most of the discs on the market are DVD ± RW, not just DVD + RW or DVD-RW.

Although DVD is still the most popular disk technology today, it will soon be replaced by two new discs, HD DVD and Blue-ray.

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