Can you partition an external hard drive to run both mac and windows files

I have an external hard drive fomated for windows NTFS. I am unable to Write mac files to this drive. I need to be able to share the files
between both platforms. Any suggestions? Thanks

Format it as MS-DOS from a Mac or exFAT from a PC, or install Mac OS X software which allows it to write to NTFS drives, or hook it up to a PC and make it available as a network share.
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