Pioneer Blue ray burner does not work in a Mavericks.

Success here, too, for several weeks after disabling Hard Disk Sleep.

Happy.

I had this problem too. It turned out it was caused by Roxio Toast Titanium 10. I had to do a complete uninstall of Toast (which included searching for all Toast files, some of which were in the library and other system folders) and then reinstalling Mavericks. The drive now works correctly.

My problem wasn't toast, I think it was Mavs....for the following reasons

1. Booted back into Lion and everything worked super duper, even my APPLE superdrive that appeared to be dead came to life.

2. Installed 10.9.1 last night and everything works as well.

My $.02

shaun

I have the BDR-208D as well, installed in an early 2008 Mac Pro. I'm so glad i found this string because, after I my boot drive failed/died, I had freshly installed El Capitan on a new boot drive and it wouldn't recognize the Blu-ray drive. So, I crossed my fingers and hoped installing Yosemite would work…which it didn't. I was planning on going all the way back to Snow Leopard until I stumbled upon this string.

MAGICALLY, after turning off the "Put Hard Disks to sleep…", my BDR-208D drive showed up in the eject menu. I even turned back on the "Put Hard disks…" and rebooted and the drive still appeared. Now I'm hoping, when I need to burn 150 Blu Ray discs next month, that it still works.

Now I'm wondering if I want to spend the many hours and attempt this with El Capitan installed.😕

I have the Pioneer BDR-209DBK in a 2008 Mac Pro. I unchecked the put hard disks to sleep button and it was working fine. But after I installed 10.11.3 it disappears after a while. It does not appear on the System Profiler. The eject button does nothing. I pulled the sata cable and put it back in the drive and it came back to life. This has only happened once. After a restart it works but not for long. Toast becomes unresponsive when I try to launch it. Any ideas?