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Note: I am aware of similar questions. The one's I seen here are for Windows, OSX, and Linux (which I do not need). I also can use Mountain Lion, which the other questions did not mention.

I was going to use NTFS, but OSX Mountain Lion can only read that filesystem and not write to it for some reason. I want to use something native between OSX and Windows, as I don't want to risk losing the data over filesystem incompatibilities.

I have USB 3.0 and want something that will allow files greater than 4GB. I do not mind installing a small set of drivers on the Windows machine(s), but I would strongly prefer to leave the Mac machine untouched.

Thanks!

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exFAT, a.k.a. FAT64 is probably the best you can use. You'll not lose any data, but you may have issues with metadata differences with the two systems. –  Rich Homolka Oct 22 '12 at 22:27
    
Actually I don't think OS X can read exFat partitions. –  martineau Oct 22 '12 at 23:10
    
@martineau: ExFAT support was added to OS X in version 10.6.5. –  Gordon Davisson Oct 23 '12 at 0:12
    
@GordonDavisson: Oh, all I know is that it wasn't supported at some point, but since it is now, for anyone interested the exFAT driver for Windows can be downloaded from Microsoft here. –  martineau Oct 23 '12 at 10:52
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closed as not a real question by ChrisF, Oliver Salzburg Oct 22 '12 at 22:46

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I want to use something native between OSX and Windows, as I don't want to risk losing the data over filesystem incompatibilities.

Whatever you choose is going to require you formatting the current drive.

have USB 3.0 and want something that will allow files greater than 4GB. I do not mind installing a small set of drivers on the Windows machine(s), but I would strongly prefer to leave the Mac machine untouched.

You should look at exFat or simply choose a Linux file system, windows should be able to read many of those, and OS X of course will also. I am not sure what USB 3.0 has anything to do with the file system of a hdd.

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