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I need to share files between Windows and Mac, so I chose exFAT as the file system for my external hard drive.

But soon I found a serious problem, when I put too many files (like 5M) in the hard drive, OS X can't mount it. Then I have to delete them in the Windows machine, after that it works well in Mac. Does anybody know how to solve the issue?

  • Have you tried repairing the disk (both on Mac and Windows)? – At0mic Sep 27 '15 at 16:19
  • Yes, but Mac still can not mount it. – Dingbao Xie Sep 28 '15 at 13:46
  • "5M" as in 5MB of files or 5 MILLION files? If the latter you may have run into a file system limitation of the number of files a Mac can read on an exFAT volume (just a guess). Try putting the files in one or more folders. Then if it can see the folder(s) but not the files in the folders then my guess is correct. – Steve Chambers Sep 29 '15 at 15:34
  • 5 million files. – Dingbao Xie Oct 1 '15 at 11:26
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The OSX EI Capitan solves the problem, apple fixes it in the new OS.

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In case you run into any further issues while using El Capitan and need different access between Windows/Mac file systems, you might give some 3rd-party software a try. I've had great luck with the free open-source version of Tuxera NTFS-3G

  • Thanks for your suggestion. If it does not slow down the read/write speed too much, I'll give a try. – Dingbao Xie Oct 11 '15 at 5:44

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