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> **Possible Duplicate:**  
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> [What filesystem for shared (read/write) PC/Mac external drive?](https://superuser.com/questions/138319/what-filesystem-for-shared-read-write-pc-mac-external-drive) 
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I've bought a Samsung S2 500GB External Hard Drive. The disk came with FAT32 file system, but I formatted it to NTFS to use large files in it, but now I can't write the disk on Mac OS X. Which file system should I use that is compatible with large files and Mac OS X/Windows reading and writing?