NVMe Problems in High Sierra

Discussion in 'Mac Pro' started by Mach Disc, Jul 6, 2017.

  1. Mach Disc, Jul 6, 2017
    Last edited: Jul 6, 2017

    Mach Disc macrumors newbie

    Mach Disc

    Jun 23, 2017
    I’m attempting to install a Samsung 960 Pro into Slot 3 of a Mac Pro 5 1 that’s running High Sierra. I've seen claims that there’s native support for NVMe drives such as the 960 Pro, and I have gotten the Mac to see the drive in disk utility in both safe mode and recovery mode. I’ve formatted the drive to Mac OS Extended (Journaled) for use as a storage drive. Now, on startup, the computer just reboots continuously until I power it off and remove the NVMe drive, and it even does this in safe mode. I can still see the drive in recovery mode. Is there anything that can be done to fix this?
  2. SoyCapitanSoyCapitan macrumors 68040


    Jul 4, 2015
    There has been some discussion that the 5,1 firmware doesn't support all of High Sierra's features. It's too early to tell what will happen next.
  3. Draeconis macrumors 6502a

    May 6, 2008
    High Sierra is a Developer Preview / Public Beta. The solution is.. be patient.

    You're not clear whether you're trying to boot from this disk, or use it as an additional storage drive either, so it's also worth reiterating NVMe disks cannot currently be booted from natively on these machines.
  4. darkgoob macrumors 6502

    Oct 16, 2008
    Make a bug report to Apple. They have publicly stated that High Sierra will install a UEFI firmware update to enable APFS booting, but they said support for mid-2012 Mac Pro is coming in a future seed. We don't know yet if the NVME concerns will get addressed at that seed or not, but I'm keeping my fingers crossed.
  5. handheldgames macrumors 65816


    Apr 4, 2009
    Pacific NW, USA
    Quick thoughts from someone running high Sierra.
    Ignore those over reacting. There are bugs but the os is damn stable.
    Pull the nvme drive from the pcie board and remount.
    Try slot 4.
  6. Mach Disc thread starter macrumors newbie

    Mach Disc

    Jun 23, 2017
    Slot 4 didn't change anything unfortunately. Neither did slot 2...
  7. pidcin1 macrumors newbie

    May 14, 2018

    Did you ever get this sorted out?

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