Two types of writable DVDs
DVD-RAM discs are recordable and rewritable. after format your DVD-RAM discs, you can use them like you would use 3.5 inch disketters or hard drive, recording over or adding to the disc multiple times.
DVD-R discs are recordable but not rewritable. if you leave the recording session open when you record a DVD-R disc, you can add additional files to the DVD-R disc in another recording session. you cannot erase a DVD-R disc or record over existing files.
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