Sometimes, your Mac Sierra won’t recognize your external hard drives. This situation occurs when after you initially eject the drive and unplug it from your system. But when you try to plug in the external hard drive again, your Mac Sierra did not recognize it. In most of the cases, the only way to solve this issue is to remove the external hard drive and then restart your Mac Sierra to show the drive. If the problem is still, there then you can follow below-mentioned steps:
Go to Settings, > Finder Preferences. Under the General tab, select the external hard drive in “Show these items on the desktop”.
Go to Disk Utility and select the external hard drive. Choose verify disc. It will find and correct minor errors.
If you are connecting the external hard drive with Mac Sierra using USB Hub, then check the USB Hub first.
From the Finder menu, choose “Go to Finder”.
Type external hard drive path (i.e. /Volumes/selectdisk)
External hard drive not showing up in Finder but visible in Disk Utility?
Then go to Finder window and view below the favorite list. If the drive greyed out? Select the external hard drive. It might visible.
Install and run Onyx (maintenance freeware) or run Kext_Utility.app.v2.6.1 and restart your Mac Sierra.
When you are following above-mentioned methods, it might be possible that you may lose files from the external hard drive not recognized Mac Sierra. So, in such situation, you can opt Drive Recovery Software which is capable of recovering files from an external hard drive not recognized Mac Sierra. For more details, you can visit this link: http://www.drive-recoverysoftware.com
Significant Features of the Drive Recovery Software:
Step 1: Download and install the demo version of Drive Recovery Software and run the software to recover files from an external hard drive. From the main screen, select “Recover Drives” option.
Fig 1: Main Screen
Step 2: Now, choose either one of the option among “Partition Recovery” and “Formatted or Reformatted Recovery” options to perform file recovery from external hard drive.
Fig 2: Select Mode Screen
Step 3: The software scans the entire external hard drive. Choose your external hard drive from which you want to recover file.
Fig 3: Select External Hard Drive
Step 4: Now, you can “Save” the recovered file to your desired location.
Fig 4: Save Recovered Files Screen
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