iMac Pro 2017, using latest Mojave... this glitch just appeared. When a blank/empty CD or DVD is inserted in my external Pioneer BDR-XD05B, the drive spins up but Mojave does not mount it. It had been working fine and nothing was changed, IE, this bug came out of nowhere. I have tried to mount the disk in Disk Utility but the option is grayed out/unavailable. The system "sees" the drive in that there is an entry in Disk Utility, but nothing can be done with it there. Multiple disks have been tried, and the burner's cable has been tried using different sockets, to no avail. The mac has been examined recently by Apple and found to be in perfect operating order with their proprietary diagnostics. Have scoured the forums but nothing works. Note that the burner works normally when plugged into a Windows box. WTF, is this a Mojave bug?