It's a tri-state checkbox. When it's checked (HD DVD for example), then the disc must have HD DVD for it to show up. When it's unchecked, then it must not have HD DVD. If you leave it at the default (grey check), then it ignores that value.
If DVD is left on the grey check, and HD DVD is checked, you should get both HD DVDs and HD DVD Combo discs. If you check the DVD box, you'll get only combo discs. And if you uncheck it, you get only HD DVDs that are not combos. |