It's working !
Today i received the
Sony Optiarc BD-5750H (It's from Hewlet Packard).
I removed the older dvd slim slot in drive, and removed the sata cable that goes to the usb-sata(II?) module in a DM8000. (keep that sata cable, because the sata connector into the usb looks like a sataII, so i think it's a sataII-sata cable)
I connected another shorter sata cable on the second sata connector on the motherboard. See picture above, it's near the optical drive location.
Other side of sata cable to Sony(HP) BD-5750H drive. Mounted the optical slim drive like Dream Multimedia show, and started the DM8000.
It's booting ok, and the DM8000 recognise the "hp BD RW BD-5750H" with OE2.0.0 image.
I try to play a dvd, but dvd player didn't start playing.

(can dmm work on this, playing movie DVD on /dev/sr0 BD-drive)
Then i use DVD burn plugin, and that is working.
So the drive it selves is working on DM8000 second sata connector on motherboard.(see second image above)
I use OE2.0.0 image of dmm (original), maybe they can explain why dvd player isn't working, but DVD burn plugin does.
Because it's a experimental oe2.0.0 image, i guess they're working on it to get it better.
Location of BD RW drive connected to second sata controller on DM8000 motherboard is:
/dev/sr0 (with nothing connected to usb-sata internal)
Only advice i want to give:
My previous dvd-rw drive was a slot in type. The BD-RW drive that i have now has a tray.
I miss my slot in, because a tray is a bit eeh sensitive for mechanical force, and doesn't close as easy as inserting a disc in a slot in drive. Sometimes the tray isn't closing properly, and then i have to move the tray a bit to get it close, and sometimes press more times to keep it close. (maybe that's the downside of buying something from internet that is located at other side of the world (like HongKong->Amsterdam). Lots of post travelling and maybe mechanical force).
So if you get a Blu Ray slim drive, get a slot in one, and not with tray.
A Blu-Ray slim drive recorder with slot-in is:
Sony Optiarc BD5850H (I recommend that one for the DM8000)