HELP! Yosemite won't recognize exFAT USB thumb drive

Discussion in 'OS X Yosemite (10.10)' started by Mid7night, Nov 5, 2014.

  1. Mid7night macrumors newbie

    Nov 5, 2014
    I've got a 32GB exFAT-formatted USB drive that I use for shuttling files between work (Win7 PC) and home (Macbook Pro Retina). I up'd to Yosemite like many others after IOS8 also dropped, and didn't have any noticeable issues; until I tried plugging in my USB flash drive.

    It's completely invisible to my Mac. It doesn't auto-mount, it doesn't even show up in Disk Utility for diagnosis.

    It still loads fine on my work-PC (no surprise), but here's the kicker - It still mounts perfectly on my wife's Macbook on Mavericks.

    I plugged it into my wife's Macbook and it popped right up, copied over a file as a test, then ejected it properly and tried re-mounting on my MacbookPro; still not loading.

    Help please!? I've Googled this over and over and got nothing. What am I missing?
  2. T'hain Esh Kelch macrumors 601

    T'hain Esh Kelch

    Aug 5, 2001
  3. Mid7night thread starter macrumors newbie

    Nov 5, 2014
    Yes. Both have worked for other devices recently.
  4. ddmcnair macrumors member

    Apr 25, 2011
    Make sure in Finder Preferences, under General External Disks is checked. I attached an image to show you what I am talking about.

    Attached Files:

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