In order to make a drive compatible with macOS which is formatted for Windows, it's best to re-partition and re-format to a macOS filesystem in order for the drive to work on macOS.macOS can read but not write to NTFS formatted drives.'Read Only' mounted drives cannot be written to with macOS computers.macOS computers mount NTFS formatted USB drives as 'Read Only'.Time Machine backups require the device to be HFS+ formatted.HFS+ shows up as Mac OS Extended (Journaled).HFS+ formatted drives have Operating System Compatibility with macOS. Select the appropriate Windows OS from the knowledge based article and follow the steps to format the drive to NTFS, please refer to Answer ID 8200: Instructions to Format a Drive for Use with Windows or macOS. In order to make a drive compatible with a PC which is formatted for macOS, it's best to re-partition and re-format to a Windows filesystem in order for the drive to work on the Windows system.WD external drives that are sold as “macOS” drives, or are setup for a macOS file system, will not be recognized by any version of Windows OS.NTFS formatted drives have Operating System Compatibility with Windows OS.

If the drive has been reformatted, it's possible to download the software which the drive originally shipped, please refer to Answer ID 10346: Download Software, Firmware and Drivers for WD Products.The following article provides details for the drive out of box & Operating System Compatibility, Answer ID 25242: How To Format an External Drive or Memory Card to Out of Box and OS Compatability.Please refer to the below table for the best file system you should reformat your drive. If this is the case it's best to reformat the drive. If the drive is not immediately recognized (or appears to be read only), it is likely formatted for a different Operating System. Upon connecting to the computer, the external hard drive should be recognized and ready for use. External hard drives may ship with Windows NTFS, macOS HFS+, or exFAT file systems.

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