CD+RW++DVD+RW

= = = = =CD RW: = = = = = Compact Disc Rewritable (CD-RW) is a rewritable optical disc format. Known as CD-Erasable (CD-E) during its development, CD-RW was introduced in 1997, and was preceded by the never officially released CD-MO in 1988.CD-RW discs are usually produced in the most common CD-R disc capacities such as 650 and 700 MB, while smaller and larger capacities are rarer. CD-RW recorders typically handle the most common capacities best. In theory a CD-RW disc can be written and erased roughly 1000 times.Although in practice this number is much lower.   =DVD RW: =

A DVD-RW disc is a rewritable optical disc with equal storage capacity to a DVD-R, typically 4.7 GB.The format was developed by Pioneer in November 1999 and has been accepted by the DVD Forum. Unlike DVD-RAM, it is playable in about 75% of normal DVD players.The smaller Mini DVD-RW holds 1.46 GB, with a diameter of 8 cm.The primary advantage of DVD-RW over DVD-R is the ability to erase and rewrite to a DVD-RW disc.DVD-RW discs may be written to about 1,000 times before needing replacement, making them comparable with the CD-RW. DVD-RW discs are commonly used for volatile data, such as backups or collections of files. They are also increasingly used for home DVD video recorders. One benefit to using a rewritable disc is if there are writing errors when recording data, the disc is not ruined and can still store data by erasing the faulty data.