I have an Asus bluray drive in the lower bay of my 2009 mac pro. I use it to backup my bluray collection with makeMKV and also so I can play the movies on my iDevices. Now here is the strange thing. When I put a disk in to rip, it works fine and the system sees it and makeMKV rips it flawlessly. But then if I dont get the disk out after a few minutes after the rip finishes, the system seems to lose the drive entirely. By lose I mean the disk disappears from finder, and the drive itself dissapears from disk utility. If I try to look at system profiler after this happens it simply says "There was an error while scanning for Serial-ATA devices." when looking in the sata section. The only way I can get the system to re-recognise the drive is to fully shutdown then reboot. Upon reboot the system sees the disk and drive again fine. If there is no disk in the drive, the system never loses the drive. Its only when a disk is sitting idle in the drive that the system loses it. I have checked the connection to the drive and it is fine, so im at a loss as to what is happening here...? Any insight would be great!