BAckwards compatibility - Blu-ray Forum

ra7968 · 11-24-2008, 02:29 AM

How exactly does the backwards compatibility on a BD player work to be able to play DVDs and CDs? Do the players have a red laser and a IR laser head in addition to the blue laser? Or, does the blue laser somehow track to and read the larger pit/pitch disks?

WriteSimply · 11-24-2008, 08:24 PM

Depends on the make and model of the player. The earlier models have dual optical pick-ups for BD and DVD/CD; a few of them only reads BD and DVD. For the newer models, there is only one OPU.

The same thing happened when DVD was first introduced.

fuad

Anthony P · 11-25-2008, 02:21 AM

there can be one or more OPUs (optical pickup unit) but like with CD/DVD you have different diodes.

11-24-2008, 02:29 AM	#1
ra7968 Junior Member Member since:Mar 2008	BAckwards compatibility How exactly does the backwards compatibility on a BD player work to be able to play DVDs and CDs? Do the players have a red laser and a IR laser head in addition to the blue laser? Or, does the blue laser somehow track to and read the larger pit/pitch disks?

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11-24-2008, 08:24 PM	#2
WriteSimply Blu-ray Ninja Member since:Sep 2006 Location:Kuala Lumpur, Malaysia	Depends on the make and model of the player. The earlier models have dual optical pick-ups for BD and DVD/CD; a few of them only reads BD and DVD. For the newer models, there is only one OPU. The same thing happened when DVD was first introduced. fuad

11-25-2008, 02:21 AM	#3
Anthony P Blu-ray Count Member since:Jul 2007 Location:Montreal, Canada	there can be one or more OPUs (optical pickup unit) but like with CD/DVD you have different diodes.

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