First post here. New to mac after a 14 year hiatus. I recently installed a new pioneer BDR-205 blu-ray SATA drive as a second lower drive in my mac pro 2009 running SL and fully updated. The original upper drive is a model HL-DT-ST DVD-RW GH41N. Pioneer and OWC both confirmed that the new drive would be plug and play. After proper installation, I confirmed that both drives could at least play a dvd. Checked cables and are fine. But after using the computer for a while and then trying to open the new blu ray drive, the eject won't open it, rather eject only opens the upper first drive. The new drive shows in the system profiler but not the disk utility or anywhere else. When I click on the eject icon at top right of screen, that action hangs for a while. When it resolves itself, only the upper primary drive is able to eject. Clicking alt + eject on keyboard temporarily shows the eject symbol on screen but either does nothing or opens/closes the wrong upper drive. I reboot, use the computer for a few hours, try it again to check it but the same problem exists. Boot up next day and both drives are working fine, play discs, eject separately, etc. But after being online for a couple of hours, I went to check on the system profiler if the second drive was still there, and the system profiler crashed when I clicked on the "disc burning" tab. I forced it to quit and reopened the system profiler, clicked on the disc burning tab. It again wasn't responding so I let it go for a while. Came back and saw that it showed only the upper drive in the burning tab. Both drives show up in SATA tab but probably not for long if the pattern is the same as yesterday. Lower drive again doesn't respond to eject. Alt + eject only opens upper drive. Clicking the eject icon on screen shows both drives but the lower one will not respond. This is the same pattern, so the problem is not going away. FYI- I've researched other similar help threads everywhere and I don't see any options for "cable select," jumper options or the like with this new drive. Again, this optical drive is supposed to be plug and play. Can't understand why the lower drive disappears and stops working seemingly just by using the computer for a few hours. Any ideas?