What's the difference between +RW and -RW?

It's a format that your drive uses when you burn a CD/DVD. Check to see what your burner supports.

What is the maximum recording speed supported by the Verbatim 4.7GB 4X DVD+RW discs?

The maximum recording speed supported by the Verbatim 4.7GB 4X DVD+RW discs is 4X.

Each DVD in the Verbatim 4.7GB 4X DVD+RW pack has a storage capacity of 4.7GB.

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Verbatim 4.7GB 4X DVD+RW 30 Packs Spindle Disc Model 94834