How to Partition and Format a WD Drive on Windows and macOS

External hard drives and external solid state drives come pre-formatted and ready for use. Internal HDD and internal SSD drives do not ship pre-formatted and will need to be Partitioned and formatted before being used.

Please note the instructions do not differ when formatting different capacity sizes, this is not capacity specific.

Select an Operating System (OS)

Operating System
Windows 10 and 8.1 Click here for Instructions
Windows 7 and Windows Vista Click here for Instructions
macOS 10.14.x (Mojave) Click here for Instructions
macOS 10.13.x (High Sierra) Click here for Instructions
macOS 10.11.x (El Capitan) and macOS 10.12.x (Sierra) Click here for Instructions
macOS 10.9.x (Mavericks), and macOS 10.10.x (Yosemite) Click here for Instructions
macOS 10.7.x (Lion), and macOS 10.8.x (Mountain Lion) Click here for Instructions
Both Windows and macOS (exFAT & FAT32) Click here for Instructions

IMPORTANT Important: If at any time an error occurs stating that the drive can not be dismounted or unmounted, this is not caused by an issue with the hard drive. Please see Answer ID 8575: When formatting or partitioning a drive, an error occurs stating the drive cannot be dismounted or unmounted for additional information on this particular issue.

Please select an Operating System (OS) from the table above to display instructions for a specific OS.

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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