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Click "Go" and select "Utilities" from the drop-down list. Select your hard drive, optical drive or other attached drive in the sidebar.
Click the "Mount" button. If the operating system already mounted the drive, an "Unmount" button displays instead. Click the "First Aid" tab and select "Repair Disk," if available. You may need to restart your computer and follow the prompts to complete the repair. Click the "Finder" icon in the Dock and look for your drive in the sidebar. Restart "Disk Utility" if you had to restart your computer to perform a repair and you still don't see your drive.
Select your hard drive from the list and click the "Erase" tab. Click the "Format" drop-down menu and select the format you want to use. Click "Erase" to format your hard drive. If you need to back up any information on the drive, first connect your drive to a computer that does recognize the drive and transfer the data to a new storage device. Press the power button on your computer and hold down "Command-S". I'm using a two-drive USB hard disk case. So I am just adding this answer for others that have the same situation.
Before We Begin: Read-Only Volumes and NTFS
That may be all it takes to solve it for you like it did for me! That was how I discovered that my USB device was detected by the computer but advertised no storage units. Thank you for your interest in this question. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site the association bonus does not count.
Would you like to answer one of these unanswered questions instead? Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Sometimes Mac doesn't recognise my external hard drive Ask Question. Asked 3 years, 1 month ago. Active 11 months ago. Viewed 58k times. What could be the problem?
Why a flash drive is not showing up on Mac?
Remember, we're not there to look over your shoulder. Also, can you expand on the external drive as well? What do you mean "restart several times"?
Are you referring to the drive or to the MBP? Try this There's still lots of details still missing, Please reread the comments. There can be a number of reasons why your Macbook Pro won't recognize a drive. However, in Console, you can see that it is detected and an error is generated: When you attach your USB devices, have Console running and watch to see if the device is detected and whether an error is generated.
First, see if they are listed. Use this step as a last resort. If possible, try to backup any files you want to keep to another computer. Use the following steps to format the hard drive. Right-click the external hard drive in Disk Management. Click Format. Type a name for the drive. Method 4. Open the Finder. Click Finder. It's in the menu bar at the top of the screen on the left next to the Apple icon.
This displays a drop-down menu. Click Preferences…. It's the second option in the "Finder" menu. This displays the preferences menu.
Click the General tab. It's the first icon at the top of the preferences menu. It has an icon that resembles a light switch. Click the checkbox.
USB External Troubleshooter | Seagate Support US
Method 5. Reset the SMC. The way you reset the SMC is different depending on what type of Mac you have. Method 6. Click Applications. It's in the side bar to the left. This displays all the applications installed on your Mac. Click Utilities. It's the blue folder in the Applications.
Reformat External Hard Drive for Mac: Ultimate Guide in 12222
This displays all the utility programs for your Mac. Click the external hard drive volume. It's listed below the drive name in the sidebar to the left. This displays how much of the external hard drive has been used. Click Mount if available. This button is at the top of the Disk Utility app. This forces Mac OS to read the external hard drive.