This question already has an answer here: • 10 answers I have been using NTFS, but I recently took a drive which is normally attached to a Mac mini running Lion (using Paragon NTFS) and attached it to Windows 7 because the drive was disconnecting spontaneously. Diagnostics didn't show a problem, but I decided to go ahead and copy it to another drive anyway. It showed up on Windows 7 and I selected the two folders to copy to another drive and nothing happened. The drive disconnected and then it lost a whole folder about 1TB - I believe it's probably still there since the space is used up, but Windows must have had some kind of problem. I reattached it to the Mac, but the stuff is gone. I don't know if it's bad filenames or a bug in Windows 7 or Paragon, or what, but this isn't the first time I've had problems with external USB drives going between platforms or external drive failures when attached to OSX. Normally I leave them attached to only one OS, but I need to be able to move them around if I have to get to the files from another machine.

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Question is more for the future - what cross-platform file system should I use for these external drives? Or should I get away from moving these things between platforms?

There is no perfect solution for all situations. 'Best' varies based on your requirements. I use NTFS on several 1TB USB hard drives for the wide support it has on multiple devices, because I often take them to clients' houses and I know the files will be accessible regardless of the operating system with no extra set up required in most circumstances. Likewise, NTFS is supported by almost all media centres and games consoles so if I want to play a movie on a non-networked device I'm likely to grab on of these hard drives.

NTFS is also fairly good for data recovery, if only because of its widespread usage - many software packages exist specifically for recovering a 'Lost Folder' on an NTFS partition. However if I personally planned to share 3TB of data between multiple operating systems, I would get a NAS rather than a USB connected device - for a little bit extra cost, I have far more flexibility, security and peace of mind.

These newer file systems not have the 4GB file size limitation! Scroll down this page for the instructions on how to change the file system. Thank you very much for this help! I had no idea about this limitation and was about to destroy my USB with a sledgehammer. No need for that. In the 'File System' dropdown, choose exFAT instead of NTFS. Click Start and close this window when finished. From then on, that drive should work fantastically between Mac and Windows machines.