How to test a drive on a Mac OS Snow Leopard through Mac OS Mavericks:. Locate and open Disk Utility from Utilities, within the Applications folder. Alternately, if the Finder is active in the Menu Bar, use the key combination Command+Shift+U to open the Utilities Folder.
Unable to format / erase hard drive. Set the format type to Mac OS Extended (Journaled.). Eject all the mounted ones except for the one that you have to format. Now go to disk utility, select external hard drive and erase. This should work. Share| improve this answer. Answered Dec 26 '16 at 10:39.
Click on Disk Utility. Or from Spotlight (The magnifying glass icon located at the right end of the menu bar). Select the drive or partition on the left window pane and then select the First Aid tab.
Select the Volume Icon which is the indented icon just below the disk shown as WD Passport below if the First Aid button is greyed. Click Verify Disk to check a drive or partition for errors but not repair them. Click Repair Disk to check a drive or partition for errors and attempt to repair any problems found. Click Verify Disk Permissions to check the permissions on a drive or partition but not repair any errors. Click Repair Disk Permissions to check the permissions on a drive or partition and attempt to repair any problems found. If your Western Digital drive fails click here for warranty services, please see. How to test a drive on a Mac OS Yosemite through Mac OS Sierra:.
Locate and open Disk Utility from Utilities, within the Applications folder. Alternately, if the Finder is active in the Menu Bar; use the key combination Command+Shift+U to open the Utilities folder. Click on Disk Utility. Or from Spotlight (The magnifying glass icon located at the right end of the menu bar). Select the indented icon of the drive to be tested.
This is the data volume of the disk. Click First Aid from the tabs active tabs as seen below. A drop-down will appear prompting to confirm checking the volume for errors.
First Aid process will run several seconds to several minutes, depending on the amount of data on the drive, and any repairs to the file structure, data integrity, or permissions performed. Click the triangle icon to Show/Hide Details to view detailed information about the progress or any problems found. Click Done to close the dialog box.
![Format Format](/uploads/1/2/5/3/125354286/960723334.jpg)
If your Western Digital drive fails click here for warranty services, please see In case the answer did not answer your question, you can always visit the for help from WD users.