What does the "RW" logo mean in a DVD+R?
If you look at this product:
you can clearly see that it is a DVD+R, i.e. once it is written, it cannot be erased/rewritten.
Then what does the "RW" logo (in the lower right corner) mean? I thought it stood for ReWritable, but experimenting with the medium shows that it is not.
12 Answers
It's the logo of the DVD+RW alliance, the developers of the DVD+R and DVD+RW formats.
History of the Alliance
The DVD+RW Alliance is a voluntary group of industry-leading personal computing manufacturers, optical storage and electronics manufacturers including Dell, Hewlett-Packard Company, MCC/Verbatim, Philips Electronics, Ricoh Company Ltd., Sony Corporation, Thomson multimedia and Yamaha Corporation. The group seeks to develop and promote a universally compatible, rewritable DVD format to enable true convergence between personal computing and consumer electronics products.
The logo distinguishes DVD+R/RW disks from DVD-R/DVD-RW and DVD-RAM disks, which are competing and incompatible formats.
1As previously answered, RW is the logo of DVD+RW Alliance (Dell, HP, SONY, to name a few well-known names) that developed the "DVD+R" format (known as the "Plus" format).
This is in contrast to the DVD Forum (Hitachi, Toshiba, and interestingly, also SONY, among a few more) which developed the "DVD-R" (known as the "Dash" format... they will be very mad if you call it the "Minus" format).
