At some random occasions, your Mac Sierra may not 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 general, the only way to resolve this issue is to remove the external hard drive and then restart your Mac Sierra to show the drive. If the problem still persists, there then you can follow the 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 be now 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 on Mac Sierra. For more details, you can visit this link: http://www.drive-recoverysoftware.com
Significant Features of Drive Recovery Software:
Step 1: Run the Drive Recovery Software on your Mac Sierra machine and connect the unrecognized external HD to it. On the main screen, choose Recover Partitions option. Select the external drive from the list of available drives. Click on the Scan button.
Figure 1: Main Window
Step 2: The software then starts to scan the external HD for the data.
Figure 2: Scanning for Files
Step 3: The preview window appears at the end of the scan process. Check for your data under File Type View and Data View layouts.
Figure 3: Recovered Files
Step 4: You can preview the recovered file items and mark them for saving.
Figure 4: Preview
Step 5: You can save the files regained from the external HDD to any location only if you are using the licensed version of the software.
Figure 5: Save Recovered Files
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