Formatting in HFS (Mac OS Extended) or FAT32 or NTFS-3G can be done with the Mac OS X Disk Utility. You should be able to see the external hard drive under the External heading in the sidebar on the left.
Best For Fast Data Transfers: Samsung Ssd External Hard Drive For Mac M1. And for others, to get to this particular Properties pop-up window, you need to right-click over your portable hard drive name in file manager, select Properties. Select "Preferences", and then choose " General " from the window that appears. Then the OS wouldn't even show that the external drive existed. When your external hard drive can show up in Disk Utility, follow the below guidance. Scroll down to find the external hard drive you want to eject. i was having the same problem, not sure if you all got it figured out already. Here are some possible reasons why the ejection didn't work: The external hard drive or files on the drive are currently in use. To resolve Mac external hard drive sleep issue, correct the default sleep setting from the Energy Saver window. my external hard drive is a clone of my internal Retina Macboo Pro hard drive. Click on the Apple icon then select System Preferences. In case you are unable to eject the external hard drive using the "Safely remove Hardware and Eject media", you can use disk manager to conduct the task. Drag the device to the Trash on the desktop to eject it, as an alternative. Go to Terminal and type this: Code: $ lsof /Volumes/Your\ External\ Disk\ Name\ Here. Click on the Apple menu icon and select "Go" then "Utilities.".