If you're a DIYer and you'd like to go the free route, you'll find a Sourceforge project called NativeNTFS-OSX that gets the job done.
It includes several additional utilities for people who need to tinker or repair, to enable you to format drives with NTFS, check NTFS partition integrity, fix errors, and more. Paragon Software's NTFS for Mac 12 is another excellent choice.
NTFS for Mac costs $31, and you can download a demo first to see how it does. It uses smart caching to keep data transfer as fast as possible and works with every OS X version since 10.4 (Tiger). Tuxera's NTFS for Mac is one of the best ways to do it. Whatever the case, the good news is that it's not a show-stopper: There are a few utilities out there that will enable Macs to write to mounted NTFS volumes. Maybe the drive you're using has to be used with a PC occasionally. Obviously that solution doesn't work for everyone.
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