DVD-RW burner

I thought DVD-RW & DVD+RW drives were different because some computer ads ive seen state that there is + or - drive and some say multiformat DVD RW.
I thought all this because my laptop has a DVD-RW drive and it doesnt read blank DVD+RW disks.

Anyone know why?
 
i didnt think +R disks were compatible in -R burners and vice versa. So whats the point of making sure u buy a +- burner, if you can burn both types of DVD's anyway? That doesnt make sense to me.
 
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