External drives won't auto-mount on new MacBook

Discussion in 'MacBook' started by GeoBoy, Jul 15, 2015.

  1. GeoBoy macrumors newbie

    Jul 15, 2015
    Setting up my new 12'' MacBook and having trouble with any external drives automatically mounting when plugged in.
    I have tried the new SanDisk Dual USB (A+C) flash drive directly connected via USB-C as well as a WD USB3 hard drive connected with an Apple USB-A to USB-C adapter.
    Both drives are visible in disk utility, and I can mount them manually just fine, but it seems like those steps shouldn't be required. I have also "verified" and "repaired" them several times even though there are no issues identified.

    Anybody else have this problem or know of a solution?
  2. ZipZap macrumors 603

    Dec 14, 2007
    Why do you think they are not mounted? Because nothing appears on your desktop?
  3. GeoBoy thread starter macrumors newbie

    Jul 15, 2015
    Yes, nothing appears on the desktop and the drives are grayed out in disk utility till I select then and "mount", then they appear on the desktop.
  4. Fuchal macrumors 68020

    Sep 30, 2003
    I've had this problem in general on all of my Macs lately... :(
  5. palpatine macrumors 68040

    May 3, 2011
    i get the same problem every once in a while. as i recall, restarting clears up the problem. i don't see this issue on my rmbp.
  6. smacx macrumors newbie

    Jan 2, 2013
    I also had this issue when I connected my external drive with 3 partitions. First time it mounted 2 partitions. The third one even couldn't be mounted via disk utility. After reconnecting the same happened, only that this time a different partition didn't mount.
    When I connect my Camera (Sony A7R) to import Pictures into Lightroom, it hangs during import. Maybe it imports 1 picture after 10 Minutes. At the same time I can access the Camera though the finder and copy the Pictures without problems.
  7. itb165 macrumors newbie

    Dec 2, 2007
    I'm having this problem as well. In general, I've always had a problem with external hard drives and macs, but on my new macbook I can't get my external to appear and I'm using the apple usb adapter. Hard drive works fine when connected to other computers.
  8. BoneHead001 macrumors 6502

    Nov 13, 2013
    I had this problem this weekend. I ran disk repair and restarted. It fixed the problem.
  9. bjet767 macrumors 6502a

    Oct 2, 2010
    Some external USB drives don't appear on the desktop on my rMB, but that always show up in the finder.

    If they are in the finder they are mounted.
  10. tbirdparis macrumors 6502

    May 30, 2015
    My rMB didn't show the usual Macintosh HD on the desktop when I first started it up either. I think a lot of, if not all, macs these days are being shipped with the default setting to not show drives on the desktop, who knows why. If you open the finder preferences (not system prefs, finder menu/preferences) you'll see under the general tab a list of items you can choose to show on the desktop. If any of them are unchecked (hard disks, external disks etc) then that's your problem right there. Unchecked doesn't mean they're not mounting, just that there's no icon on the desktop for them, old school mac style. I guess they must be going for a more windows-like default look? I always check all of them, feels wrong to use a mac without seeing drive icons on the desktop.

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