Compatibility With Windows and Macintosh
ext4 does not yet have as much support as ext2 and ext3 on non-Linux operating systems. ext2 and ext3 have stable drivers such as Ext2IFS, which are not yet available for ext4. It is possible to create compatible ext4 filesystems for use in Windows by disabling the extents feature, and sometimes specifying an inode size. Viewing and copying files from ext4 to Windows, even with extents enabled, is also possible with the Ext2Read software. However, there are no available drivers that provide full read and write compatibility with Windows. Another option for using ext4 in Windows is to use Ext2Fsd, an open-source driver that supports writing in ext4 under Windows.
Mac OS X has full ext2/3/4 read/write capability through the Paragon ExtFS software, which is a commercial product. Free software such as ext4fuse has only read-only support with limited functionality.
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