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If you look at this product:

Verbatim DVD+R

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.

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i add this for information:DVD+R and DVD+RW DVD+R and DVD+RW formats are supported by Philips, Sony, Hewlett-Packard, Dell, Ricoh, Yamaha and others. DVD+R is a recordable DVD format similar to CD-R. A DVD+R can record data only once and then the data becomes permanent on the disc. The disc can not be recorded onto a second time. DVD+RW is a re-recordable format similar to CD-RW. The data on a DVD+RW disc can be erased and recorded over numerous times without damaging the medium. Note: DVDs that have been made using a +R/+RW device can be read by most commercial DVD-ROM players. –  BlueBerry - vignesh4303 Aug 6 '12 at 14:18
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1 Answer

up vote 6 down vote accepted

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.

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This makes very much sense: in the image it is too small to be read, but under the "RW" logotype it says "DVD+R", which identifies the type of medium. –  fdierre Aug 6 '12 at 14:28
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