This article explains details on WD NAS drives being reformatted as FAT32, NTFS, or a Mac File System.*END
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The Western Digital units mentioned below use a proprietary file system and cannot be reformatted as FAT32, NTFS, or a Mac File System.
The file system on the My Cloud and other WD NAS devices support access from Windows, Mac and most Linux based computer systems through a SAMBA network sharing connection.
In case the answer did not answer your question, you can always visit the WD Community for help from WD users.
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