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Apple com app store. Summary: When plugging your Seagate Backup Plus into a Mac computer, you may find the drive stops working and is not mounting in Disk Utility. Have you been troubled by the issue? This post will give you 7 workable solutions to fix Seagate Backup Plus drive not mounting/working issue on Mac.

Seagate Backup Plus external hard drive is often used for Time Machine backup. But many users reported that they were unable to mount Seagate Backup Plus drive on Mac computers. And some say theirSeagate Backup Plus couldn't work on Mac after plugged in. Here is a real example:

'I really need your help. My Seagate Backup plus just stopped getting detected (led not working anymore) with my MacBook Pro 2016 model (with USB Type C to USB 3 connector) suddenly. It was working fine 1 month before. I tried this backup disk with a Windows computer and the LED light is working in that case but I am not able to get it to work with my MacBook Pro anymore. Any idea guys?'

In fact, this issue is very common, especially for those who frequently share the same drive between different computers. This page will help when Seagate Backup Plus drive doesn't work on Mac.

7 solutions to fix Seagate Backup Plus not mounting, not working on Mac

For some reason, Seagate external hard drives could not be recognized by Mac. If you can't mount the Seagate Backup Plus drive in Disk Utility, the hard drive won't work on Mac. And you can't access the data stored on it. So it's very urgent to fix the problem to make it work again.

Here are solutions to the Seagate Backup Plus not working or mounting issue.

1. Have some basic checks

Sometimes, the Seagate Backup Plus drive won't mount on Mac is due to the bad USB port or cable. Thus, once the Seagate Backup Plus drive stops working, you can first do some routine checks as below.

• Step 1. Check if the cable of the Seagate Backup Plus drive is connected properly to your Mac
  If the drive isn't properly plugged in, it will fail to mount as it received not enough or even no power.
• Step 2. Make sure the USB cable is not at fault
  Try using a different USB cable to see if that fixes the problem.
• Step 3. Check if the USB port is damaged
  Plug the Seagate Backup Plus into another USB port if you have another one. Otherwise, insert another external storage device in this USB port.
• Step 4. Check whether the Seagate Backup Plus external hard drive is powered properly
  In general, the current of USB port 2.3 and 3.0 are enough for the most external portable hard drives. But sometimes this amount of current may be insufficient while the drive is spinning up.
• In this situation, you can try to connect the Seagate Backup Plus with a USB Y cable if you have one. And for Seagate Backup Plus Hub and Expansion Desktop, a power adaptor is required for power supply.
• Step 5. Access the drive on other Macs
  Connect the Seagate Backup Plus drive to another Mac computer to see whether it works on that one or not. If the drive works on another Mac computer, there is something wrong with your Mac computer rather than the drive. What you should do is to ask for help from Apple support.
• Step 6. Check if the format of Seagate hard drive is supported by macOS
  For example, a Windows BitLocker encrypted drive will not be working on Mac originally. Your Mac computer is not able to mount it. To fix the problem, you can plug the Seagate Backup Plus into a PC and then access the drive on Windows.

2. Check whether the Seagate Backup Plus is showing up in Disk Utility

To troubleshoot this problem, you first need to know if this Seagate hard drive is detected by your Mac. Open the Utilities folder in your Applications folder. Launch Disk Utility and check the left pane then. If you can't see the external hard drive in macOS, the drive probably has been physically damaged. In that case, you should send the drive to the local repair shop. Otherwise, you can move to the next solution.

3. Check if the Seagate Backup Plus drive is mounted in Disk Utility

If the Seagate Backup Plus is mounted in Disk Utility, you should blame the wrong computer settings or outdated computer. Fortunately, it's easy to fix these issues. Just try solution 4 and solution 5. If the external hard drive is greyed out in Disk Utility, it's not mounted. You can try right-clicking the Seagate Backup Plus and choose the 'Mount' button. If that doesn't work, the drive has some file system problems. Please follow the solution 6 to repair the problem.

4. Show the Seagate Backup Plus on the desktop

If the Seagate external hard drive is mounted in Disk Utility, but it still doesn't show up on Mac. First of all, you should make sure the settings in Finder display drive icons on the desktop.

Step 1: Go to Finder > Preferences > General tab.

Step 2: Select 'External disks' under 'Show these items on the desktop' and then the connected external hard drive will appear on the desktop.

5. Repair Seagate Backup Plus drive via First Aid

Seagate Backup Plus not mounting issue on Mac can be caused by file system problems. Disk Utility's First Aid is a built-in tool on Mac to deal with errors related to disks, such as file system corruption. So you can try to fix the unmountable/corrupted Seagate Backup Plus external hard drive in Disk Utility by following the steps below.

Step 1: Go to Utilities Disk Utility.

Step 2: Click 'View' in the top menu bar (Or click 'View' on the top window). Then select 'Show All Devices'.

Step 3: Select the Seagate Backup Plus external hard drive from the left sidebar.

Step 4: Click 'First Aid' on the top of the Disk Utility window.

Step 5: Click 'Run' to perform hard disk diagnostics and fix the not mounting/not working Seagate Backup Plus.

6. Update the software on Mac

Software updates keep your computer and programs secure, deal with quite a few bugs, and provide new features. Out-of-date software can cause a variety of issues. It's possible that the operating system will become sluggish and the connected device may not function properly. Fortunately, you can easily update the software on Mac.

Case 1. Update the software on macOS Mojave or Catalina. If you upgrade to macOS Mojave or macOS Catalina, you should choose 'System Preferences' from the Apple menu, then click 'Software Update' to check for updates. If any updates are available, click 'Update Now' to install them.

Case 2. Update the software on earlier macOS versions. Just launch the Mac App Store, click the 'Update' tab on the top and then choose the 'Update All'.

7. Fix the not mounting or working Seagate Backup Plus drive by reformatting

If First Aid failed on the external hard drive, it might have some serious errors that are beyond its reparation capability. In that case, you need to recover lost data from the Seagate Backup Plus external hard drive as soon as possible.

Step 1. Recover lost data from the unmountable/corrupted Seagate Back Plus

iBoysoft Data Recovery for Mac is free external hard drive data recovery software. It can easily recover files when the hard drive is not working or mounting on Mac. Also, it canrecover deleted photos and lost data from formatted drives, unreadable drives, corrupted drives, and recover deleted/lost partitions, etc. It's compatible withmacOS 10.15/10.14/10.13/10.12/10.11/10.10/10.9/10.8/10.7.

1. 1. Download and install iBoysoft Data Recovery for Mac on Mac.
2. 2. Launch iBoysoft Data Recovery for Mac.
3. 3. Select the Seagate Backup Plus and click the 'Scan' button to scan for all lost data.
4. 4. Preview the searching results, choose files you want to get back, and click the 'Recover' button.

Here is a short video tutorial which shows you how to recover lost data from unmountable/corrupted external hard drives:

Apple magic keyboard deals. Step 2: Reformat the Seagate Backup Plus to make it work

After recovering data from the unmounted Seagate Backup Plus, you can now go to Disk Utility and reformat it without worrying about data loss.

• Steps to reformat Seagate Backup Plus external hard drive

If unfortunately, you can't reformat the Seagate Backup Plus drive, it must have physical issues. In this case, you have to look for help from a local data recovery company.

Bonus Part: Introduction to different Seagate Backup Plus drives

You probably use a Seagate desktop drive like Backup Plus Hub and Expansion. Or you could use a Backup Plus Portable drive like Ultra Touch and Slim. No matter which Seagate Backup Plus drive you choose, it could not work on the Mac for some reason.

Therefore, it's important to know the differences between those Seagate Backup Plus drives. This helps you to use the Seagate Backup Plus drive more correctly and efficiently, and then avoid hard disk corruption.

1. 1. Seagate Backup Plus Hub: This Seagate Backup Plus Desktop drive has large capacities with cross-platform compatibility, which means you don't have to format the drive for both Mac and Windows again. It's an all-in-one data hub and recharging station for tablet, smartphone and camera.
2. 2. Seagate Backup Plus Ultra Touch: Backup Plus Ultra Touch portable hard drives feature password protection and hardware encryption, USB-C compatibility, and file sync. You can't open the Seagate Backup Plus drive on Mac until it's unlocked. Moreover, an NTFS for Mac software is needed to use Backup Plus Ultra Touch on Mac, as it's preformatted with NTFS.
3. 3. Seagate Backup Plus Slim: Seagate Backup Plus is small enough for a loaded laptop bag. It's an ideal external hard drive with easy portability and enough storage space. But avoid dropping your Seagate Backup Plus drive during transportation, in case it's damaged and not working.
4. 4. SeagateBackup Plus Portable: Backup Plus portable drives offer easy-to-use software tools like Seagate Dashboard, so that you can schedule automatic backup and mirror folders easily.

Conclusion

No matter what caused Seagate Backup Plus not mounting, working, or readable issue on Mac, such as logical problems and physical damages, the most important thing is to back up important data or recover lost data with free Mac data recovery software. iBoysoft Data Recovery for Mac is a powerful and reliable data recovery tool on macOS which supports various external drives, including external hard drives, SD cards, USB flash drives, etc.

If you have any suggestions to solve this issue or experience any questions when using iBoysoft Data Recovery for Mac, please feel free to let us know.

Apple computers without a built-in optical drive can connect an external Apple USB SuperDrive or MacBook Air SuperDrive to read optical media such as CDs and DVDs. The Apple USB SuperDrive has a slightly longer (340mm) cable compared to the cable on the MacBook Air SuperDrive (250mm). Both SuperDrives are functionally equivalent.

Older models of the MacBook, MacBook Pro, iMac, Mac Pro, and Mac mini computers have a built-in SuperDrive. The SuperDrive uses a slot-loading mechanism which pulls the disc directly in rather than first placing the disc onto a loading tray. Older Mac Pro models use a loading tray.

J5 Ultra Drive For Macbook Pro

First steps

1. Make sure the Apple USB SuperDrive is lying flat on a surface with the silver top facing upward (shown below). If the Superdrive is oriented upside down it will not read discs.

   Correct:Aluminum enclosure is facing up

   Incorrect: Apple logo should be facing down

   Because the USB port on external displays may not be powered at startup, connect the drive directly to the USB ports on your Apple computer when you need to use the Superdrive as a startup device. Reconnect the Superdrive directly to the display when you no longer need to start the computer from the SuperDrive.

2. The Apple USB SuperDrive and MacBook Air SuperDrive are designed exclusively for use with Mac computers that do not have a built-in optical drive. Plug in the SuperDrive directly to the computer's USB port. Don't use a USB hub.
3. You can also connect the SuperDrive to the USB ports on the back of the Apple LED Cinema Display (24-inch, Late 2008), Apple LED Cinema Display (27-inch), or Apple Thunderbolt Display.
4. Be sure not to put the drive underneath anything heavy, underneath your computer, or on top of your computer.
5. If you have trouble using a SuperDrive with Microsoft Windows, try starting the computer with the SuperDrive already plugged in.

Check your disc

Before troubleshooting, first confirm the discs you are using will work with your computer. Dorma repair manual. Inserting a non-standard sized or shaped disc into a drive that is not designed to accommodate it may damage the drive. Use of such discs is not supported and any damage caused will not be covered under your Apple warranty or applicable extended service contract. The slot loading drives used in Apple computers work with only standard 120 mm round discs.

Specific troubleshooting

Below are several possible symptoms you may see. Follow the steps for the appropriate symptom to figure out whether the issue stems from the drive or the media. Be sure to inspect discs before use to ensure they are not cracked, scratched, or otherwise damaged. Inspection should include the inner ring of the disc which should be smooth and burr free. A disc with physical defects may become stuck in or cause damage to the drive.

Doesn't accept discs

1. Be sure to check your disc to make sure it is flat. You can check this by putting the disc upside-down on a flat surface. If the disc is bowed up on any side or in the center, do not use the disc because it might get stuck in the drive. Do not use discs that have anything attached to them or dangling from them (such as 'sweeper' or cleaning discs).
2. If the drive struggles when you put in a disc or stops part-way, carefully look at the disc for labels that may be interfering. If there aren't any raised labels then try putting the disc in a few more times.
3. Try another disc to see if the issue is being caused by a specific disc.
4. Make sure you insert the disc far enough for the drive mechanism to activate. You need to insert discs nearly all the way before the drive will activate and pull them in. If you don't completely insert a disc, the drive will reverse and push the disc back out.
5. Allow the drive one or two seconds to accept the disc while it is fully inserted.
6. Reset the System Management Controller (SMC).
7. If the drive repeatedly does not accept discs, contact Apple or an Apple Authorized Service Provider, or make an appointment with an Apple Retail Store.

Accepts discs but they don't mount or are automatically ejected

1. Make sure the drive is not placed upside down. The aluminum enclosure should be facing up as shown in section 1.
2. Check the disc's surface for scratches and dirt, since these things can prevent the disc from appearing on the desktop.
3. Connect the MacBook Air SuperDrive directly to the computer's USB port instead a USB hub.
4. Reset the System Management Controller (SMC).
5. Ensure your drive can read the specific type of disc being used. The System Profiler or System Information may provide additional information regarding what media your computer supports.
   • OS X Snow Leopard v10.6 or earlier: Open Apple System Profiler by choosing 'About this Mac' from the Apple () menu. Then, click More Info.
   • OS X Lion v10.7 and later: Click the Apple () menu and then hold down the Option key. Choose System Information from the menu.
6. If the disc continues to not be recognized, contact Apple or an Apple Authorized Service Provider, or make an appointment with an Apple Retail Store.

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Doesn't eject discs or discs eject slowly

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1. If the drive ejects discs slowly or appears to be struggling, insert and eject a single disc several times. Check the disc to see if it has a label or other material stuck to the disc that increases the thickness. Remove the label if possible.
2. If the disc will not eject, try pressing the eject key on the keyboard. Some older keyboards may use the F12 key to eject discs.
3. If the disc will not eject, try dragging the disc icon to the trash.
4. If the disc will still not eject, try holding down the trackpad or mouse button after restarting the computer. The Superdrive should attempt to eject the disc.
5. If the disc continues not to eject, reset the System Management Controller (SMC) and try steps 1-4 again.
6. If the disc still does not eject, contact Apple or an Apple Authorized Service Provider, or make an appointment with an Apple Retail Store for additional assistance.

Noisy or vibrating drive

1. Note that due to the way optical drives function by rotating the disc rapidly, some noise and vibration is expected.
2. If you think the drive is making noise beyond what's expected when you insert or eject discs, try inserting and ejecting a disc several times to correct the issue.
3. Try other discs to see if the issue can be isolated to a single disc, or type of disc, as opposed to the drive itself. If a disc is weighted unevenly, such as discs that have a labels or stickers, it can cause additional noise and vibration when spinning up in the drive.
4. Reset the System Management Controller (SMC).
5. Vibrations due to the optical drive being in use may be exacerbated by using the system on a surface that is not hard and level. Make sure all the plastic feet on your notebook computer are present as this could create an uneven surface.
6. Be aware that the drive should only operate horizontally, and noise may increase if you try to use it at an angle. Picking up or moving the machine while a disc is being read may result in the disc becoming unbalanced. Any damage sustained to the drive or the disc as a result of operating it in this manner is not covered by the products warranty.
7. While a certain amount of noise and vibration is expected, if you believe the noise or the vibrations being generated by the drive are not normal, please contact Apple, contact an Apple Authorized Service Provider, or make an appointment with an Apple Retail Store for additional troubleshooting, evaluation, or service options.

Scratched discs

If media is getting scratched after being used in the drive, contact Apple or an Apple Authorized Service Provider, or make an appointment with an Apple Retail Store for additional troubleshooting, evaluation, or service.

Learn more

• You can use a SuperDrive with Mac mini (late 2009) and later, MacBook Pro with Retina Display, MacBook Air, iMac (Late 2012) and later, and Mac Pro (Late 2013) computers. Note that there is no eject button on these models to eject a disc. In order to eject you can Control-click or right-click the disc icon and choose Eject from the menu that appears. You can also drag the disc icon to the trash.
• For computers that did not ship with an optical drive and do not have the Apple USB SuperDrive, you can use CD or DVD sharing to access a CD or DVD in another computer's optical drive.

See the compatibility list for Mac computers and the Apple USB SuperDrive or the MacBook Air SuperDrive.