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I had not realized that Joseph--thanks.:emoji_thumbsup: But in the end, it seems that a multi-player will need both lasers.

In my opinion that is a bit of an understatement. The main technical difference is that Blu-Ray uses a laser with a different frequency (blue, not red) than does DVD. This is the reason that the manufacturing process for BD has proved to be more difficult than for HD-DVD disks (which are really...