What are rewritable DVDs used for?
Blank DVDs come in two different formats: write-once and rewritable. Write-once DVDs are called DVD-R. This means that they are only for one-time usage. The data that you burn onto the DVD cannot be erased or replaced with other information. A rewritable DVD, or a DVD-RW, can be erased and used over and over again.Plus and Minus FormatWrite-once and rewritable DVDs can be classified as two types: plus (+) and minus (-) formats. The plus and the minus formats correlate to the DVD burning drive. Some drives may only support the plus format, while some only support the minus format. Fortunately, many drives support both.Storage SpaceA single-sided DVD+RW disc can store up to 4.7 GB (gigabytes) of content, while a double-sided DVD+RW disc can store up to 9.4 GB of content.Rewriting DurabilityUnlike the DVD-R, which cannot be used more than once, the DVD-RW disc can be rewritten about a thousand times.Speed RatingsBoth write-once and rewritable discs have different speed ratings. They can b
