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I have the KMP model from OWC in my Mac Pro, and only use OSX. It doesn't require a disc in the drive, and works as advertised. I normally don't sleep my computer, but did a test and it went to sleep. I left it for eight minutes and it didn't wake up or do anything. I don't know how long it would stay asleep, but that's my report.

That's a LGEWH10LS30KMP part # on OWC's website, and I'm using a 2009 Mac Pro with 10.6.5 still. I'll also add that I've burned many Blu-ray discs that play perfectly in a Blu-ray player. I have not made any attempt to play them in the Mac, because Steve says not to, hahahaha.
 
By the way, to the OP, it seems to be willing to let me burn data to a BD-R using the finder, as it allows me to get all the way to the step, "Are you sure you want to burn the contents of (blah, blah, blah) to a disc?" Then it says, "You can use this disc on any Mac or Windows computer. To eject the disc without burning to it, click Eject." After that it shows disc name (editable), burn speed pulldown options, and a check box for Save Burn Folder To:(whatever). Eject, Cancel and Burn buttons are all active. In other words, none are greyed out. It even has an image of a disc with tiny little letters on it that read:
BD
R

I just don't feel like wasting a BD-R to find out if it will actually burn it at this stage.
 
I have the WH10LS30 (no K) purchased from newegg, in an external FW400 enclosure. Our local HS football team was on TV, which I captured in HD on TivoS3. I used Toast 10 with their BD option to create a BD which plays in our Sony BD Player. A couple of notes:
- 5 hours to xfer out of Tivo to MPro (as expected)
- Maybe an hour to decrypt it, which didn't work anyway (no audio -- I believe a different codec)
- 12 hours to encode and burn onto a single layer BD.

I don't expect to make many BDs (or DVDs, for that matter) and the external enclosure is part of a larger effort to use the optical bays for disk drives. As little need as I have for optical (DVD and BD) an external solution for ~$150 seemed like a good solution.
 
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