Lot of Mac OS X users reported this issue in Apple support communities. External hard drive showing up in Disk utility not in Devices. This problem also happened after OS X Yosemite update.
Solution 1:-
Go to Settings -> Finder Preferences . Under the General tab, select External drive in “Show these items on the desktop”.

WD Drive manager is a end of life software, We have not tested using it with latest Mac Operating system. You can try to use WD Drive utilities to setup RAID for your device: support.wdc.com. Tucked away in the Utilities folder, Disk Utility and its First Aid feature can be used to check if a disk is damaged and repair it, create a disk image, partition a disk, and so much more. Some Mac users are reporting Mavericks data loss issues after installing OS X 10.9. The most common scenario is as follows: You had a functioning external hard drive (it doesn’t have to be a Western Digital one — other brands like Seagate, Hitachi and LaCie seem to have also been affected). WD Drive Utilities is a companion application for Western Digital drives that can help you register, configure, and manage your WD storage solutions. Worth mentioning is that WD Drive Utilities works only with certain models, and you get to see the comprehensive list of compatible WD.

Sep 27, 2019  Lot of Mac OS X users reported this issue in Apple support communities. External hard drive showing up in Disk utility not in Devices. This problem also happened after OS X Yosemite update. Solution 1:-Go to Settings - Finder Preferences. Under the General tab, select External drive in “Show these items on the desktop”. WD Drive Utilities for Windows. WD Security for Windows. WD SmartWare. Western Digital SSD Dashboard. Software for Mac GoodSync for WD. Install WD Discovery for Mac. WD Drive Utilities for Mac. WD Security for Mac. Product Firmware Product. If your product is. Every journey needs a passport. The My Passport™ for Mac drive is trusted, portable storage that perfectly complements your on-the-go lifestyle. Compatible with USB-C™ and USB-A, the My Passport for Mac drive comes equipped to connect with today's latest technology. With a new, stylish design that fits in the palm of your hand, there’s space to store, organize, and share all the.

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Solution 2 :-
Go to Disk utility and select the external drive from the left sidebar. Choose verify disc. It will find and correct minor errors.
Solution 3:-
If you are connecting your external hard drive with Mac using USB Hub, check the USB hub first.
Solution 4:-

1. Open Disk Utility. If your external USB drive drive faded/greyed out and unmountable?
2. Connect another external drive or Pen drive to computer. This drive also not recognized drive?
3. Do the proper eject from the Finder window list.
4. Restart your computer and connect the external drive.

Solution 5:-

1. From the Finder menu, select “Go to Finder”.
2. Type the external drive path what appears under Disk Utility. Ex: /Volumes/sleekdisk

Solution 6:-
Drive not showing up in Finder but visible in Disk Utility?
Go to Finder window and view below the favourite list. If the drive greyed Out? Select the drive. It might visible.
Solution 7 :-

1. Shut down your Mac computer .
2. Unplug the power cord.
3. Unplug all USB connections.
4. Wait 30 seconds or 5 minutes then plug it back in.
5. Then turn on your MacBook Pro or iMac.
6. Plug the external drive only to the USB port. Open Finder and check your drive.

Solution 8:-
Install and run run Onyx (maintenance freeware) or
run Kext_Utility.app.v2.6.1 and restart your Mac machine.
Solution 9:-
Some times this issue might happened because of the unsupported drive format.
Install Fuse for OS X, NTFS-3G for Mac OS X and Fuse wait.
Restart your computer and check the issue.
If the above methods not working?

• Install fresh OSX Yosemite.
• Connect your segate external drive or WD passport to Windows computer. Delete the partition and connect back to MacBook Pro.

If you knew any other solutions, inform us via comment.

An important application in your maintenance toolbox is the Disk Utility, which is located in the Utilities folder within your Applications folder. When you first run this program, it looks something like Figure 1, displaying all the physical disks and volumes on your system.

Figure 1: The familiar face of Tiger’s Disk Utility.

The Disk Utility application has its own toolbar that you can toggle on and off. Click the lozenge-shaped button at the upper-right corner of the window to display or hide the toolbar.

Displaying the goods on your disks

The volume tree structure on the left of the Disk Utility window lists both the physical disks and the partitions that you’ve set up. A partition is nothing more than another word for volume, which is the formatted section of a disk that contains data. A single physical hard drive can contain several partitions. The information display at the bottom of the Disk Utility window contains data about both the volumes and the partitions on your hard drive.

To illustrate: Clicking a drive labeled at the top of the tree displays a description of the drive itself, including its total capacity, interface (connection type), and whether the drive is internal or external, as shown in Figure 2.

Figure 2: Display data on a physical drive.

Clicking the tree entry for a partition, however, displays information about the type of formatting, the total capacity of the partition and how much of that is used, and the number of files and folders stored on the partition (see Figure 3).

Figure 3: Display data on a volume.

Playing doctor with First Aid

From the First Aid pane, Disk Utility can be used to verify (or check) any disk (well, almost any disk) for errors, as well as repair any errors that it finds. Here are the two exceptions when the buttons are disabled:

• The start-up disk: Disk Utility can’t verify or repair the start-up disk — that’s Mac talk for the boot drive that contains the Mac OS X system that you’re using at the moment — which makes sense if you think about it because that drive is currently being used!

If you have multiple operating systems on multiple disks, you can boot from another Mac OS X installation on another drive to check your current start-up disk. Or, you can boot your system from the original Mac OS X installation CD and run Disk Utility from the Installation menu.

Your start-up disk is automatically verified and repaired (if necessary) during the boot procedure, so you really don’t need to worry about checking the start-up disk.

• Write-protected disks: Although you can use the Disk Utility to verify CDs, DVDs, and write-protected removable disk drives (like a write-protected Zip disk), it can’t repair them.

You also can’t repair a disk that has open files that are currently being used. If you’re running an application from a drive or you’ve opened a document that’s stored on that drive, you won’t be able to repair that drive.

You can also elect to verify and repair permissions (also called privileges) on a disk; these are the read/write. If you can’t save or move a file that you should be able to access, check that drive for permissions problems. Unlike fixing disk errors, you can verify and repair permissions on any volume that contains a Mac OS X installation (whether it was used to boot your Mac or not).

In order to verify or repair, you must be logged in as an admin-level user.

To verify or repair a drive, first select the target volume/partition in the list at the left. To check the contents of the drive and display any errors, click the Verify Disk button. Or, to verify the contents of the drive and fix any problems, click the Repair Disk button. Disk Utility displays any status or error messages in the scrolling list; if you’ve got eagle eyes, you’ll note that the window can be resized so that you can expand it to display more messages. (You can also drag the dot between the left and right panes to expand the list.)

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Check your disks once every two or three days. If your Mac is caught by a power failure or Mac OS X locks up, however, it’s a good idea to immediately check disks after you restart your Mac. (Don’t forget that the start-up volume is automatically checked and repaired, if necessary.)