MacBook Pro can't mount an exFAT external hard drive when having too many files 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?
The OSX EI Capitan solves the problem, apple fixes it in the new OS.