It sounds like your friend's DVD player is likely set to 4:3 mode, so it detects the 16:9 widescreen image and adds the black bars(letterbox). Your Blu-ray player can probably tell the difference between a 4:3 and 16:9 image and automatically display the image in the proper aspect ratio.
Since the transition to digital TV, there are countless reasons why you might be seeing black bars around an image.
In the most simple terms, black bars are usually a result of a video source shot in an aspect ratio that doesn't match the screen you're viewing that source on.
I'd have your friend start with Wikipedia and go from there.
#Current_video_standards'>http://en.wikipedia.org/wiki/Aspect_ratio_(image)
#Current_video_standards
One could literally write about aspect ratios and video formats from now until the end of time.
Cale
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Host: Media Formats | Media Capacities
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