Removed the hyphen ( - ) from the name "HD-DVD" because this name is a product...
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Removed the hyphen ( - ) from the name "HD-DVD" because this name is a product name which doesn't contain any hyphen at all, fixed the name of Blu-ray; "BluRays" (incorrect) → "Blu-rays" (correct), added the tip "s" to the third person singular, added one missing comma and removed the word "then" which is completely optional in this case and makes the text longer to read for readers (superfluously).