lifespan of information saved on a drag-to-disk DVD?

Hi guys just wondering if anyone had any suggestions or thoughts on the lifespan of data saved on a drag-to-disk formated single layered +R format DVD??? 

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http://www.cdrlabs.com/forums/lifespan-information-saved-drag-disk-dvd-t20077.html
aristottle wrote:So if you were going to save date on DVD you would prefer to save it on Disk at once format?![]()
why is that considered more stable?