How to test a drive for defects or problems on a Mac

Disk Utility is a drive diagnostics which can be used to test for defects or problems on a mac. It is located within the Utilities folder inside Applications.

Note:
This utility is also available in rescue mode for testing the Mac HD boot drive. It’s best to contact Apple for more information related to accessing and using rescue mode.

Operating System
Click here for Instructions
Mac OS 10.6 Snow Leopard through macOS 10.9 Mavericks Click here for Instructions
(instructions will appear below this table)
Mac OS 10.10 Yosemite through macOS 10.12 Sierra Click here for Instructions
(instructions will appear below this table)

Select an Operating System (OS) from the list 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.

Please rate the helpfulness of this answer