When you’re stuck because your Seagate Expansion external drive isn’t showing up on your Mac.
And you’re wondering what to do.
You’ll find here 13 fixes to get your Expansion hard drive back up on your Mac.
Seagate Expansion Hard Drive Not Showing Up Mac 13 Fixes
The Seagate Expansion drives come in both NTFS (New Technology File System) and ExFAT. Both types of drives and their file systems will show up on your Mac’s desktop.
But when your external hard drive. Or your Seagate Expansion solid state drive doesn’t. What then?
Here are the things to check and fixes to get your Expansion drive showing up on your Mac pronto.
1. Check Your Expansion’s USB Cable
When your Seagate Expansion portable drive is not showing up on Mac. First check you can see the LED light on your drive.
Is it glowing? Does it flicker at all?
A glowing LED light on your drive proves your Mac is sending power to your drive down through your USB cable.
If there is no light or flickering when your drive is plugged into your Mac computer then it may be your cable isn’t working. First, make sure your cable is well seated into your Mac’s USB port. Take it out and put it back in firmly. Then do the same at the Expansion drive end of the cable.
Your cable may look perfect from the outside. But could be damaged inside.
And USB cables failing is a really common issue.
Try another cable with your Expansion external hard drive and see if your not showing up issue goes away.
CLICK HERE: To Read A Review On the Seagate Expansion On Mac
2. Check Your Mac’s Finder Preferences
Is your Mac set up for your Seagate Expansion to show up on your Mac’s desktop? You might think your Expansion drive isn’t showing up on your Mac. And your fix could be as simple as setting your Mac to show it.
To do that.
Open up a new Finder window and check your Finder preferences.
When the Finder preferences pop up window comes up.
Click on the General tab.
Then put a check in the box against External Disks.
And shortly your Expansion drive’s icon will show on your MacBook Pro. Or MacBook Air’s desktop.
Is your issue fixed?
The next fix to try is …
3. Check The USB Port Of Your Mac
When you’re sure your USB cable isn’t the issue. And you’ve set your Finder preferences is set to show your Expansion drive on your desktop.
But your Seagate drive still doesn’t show. Then you may have an issue with your Mac’s USB port software.
When you’ve plugged in and out different types of USB devices. Maybe one of those devices didn’t eject itself quite right. Sometimes this hangs the software sitting at your Mac’s USB port.
You can connect your Expansion external hard drive to another USB port on your Mac. Does your external hard drive work now?
If not then carry out a full shutdown of your Mac.
Click on the Apple symbol top left of your desktop. Then pick Shutdown from the menu.
After your Mac shuts down, wait 10 seconds, then press the power on button.
A full shutdown restarts the software sitting at your Mac’s USB ports. And resets your Mac’s internal hardware registries. Restarting the software on your USB ports.
Log back in. And see if your Seagate Expansion not showing up on Mac issue has gone.
4. Seagate Expansion External Hard Drive Not Showing Up On Mac Quite Yet
What’s that I hear you say.
Yes, that’s right.
It could be your Seagate Expansion hard drive isn’t showing up right now. But wait a while and it could show up soon.
Sounds odd? Yes, odd but true.
Leave your Expansion drive plugged in. And just wait.
Sometimes 5 minutes or longer. Could be up to an hour for a larger Expansion desktop drive.
When you plug in an external disk, your Mac OS X runs a check on the drive.
If your Mac OS finds an issue, it then does its best to repair the issue. The repair process could take a while. And if your Mac is successful. After that process your Seagate Expansion hard drive will show up.
Sometimes patience is rewarded.
5. Reset The NVRAM On Your Mac
Your Mac’s NVRAM holds hardware settings for your Mac. When those NVRAM settings get jumbled. You may then need an NVRAM reset.
Carry out the reset and your Seagate Expansion drive may well show up on your Mac.
On your Intel based Mac, MacBook Pro or MacBook Air. Fully shut down your Mac.
Apple Logo > Shutdown.
Wait for your Mac to fully shut down. Then power on.
While you power on. Hold down the OPTION + Command + P + R keys.
Hold down all the keys at the same time.
You’ll need to wait for at least 20 or so seconds.
Wait till your Mac reboots, holding all the keys. Wait till your second start up chime. Or you see your Apple logo.
Then you can let go.
Does your Expansion Seagate hard drive show now?
6. Does Your Seagate Expansion Hard Drive Show Up On Another Mac?
Time to take your Expansion external hard disk drive to another Mac.
Does it show up when you plug it into that other Mac?
What is the difference between that Mac and yours? What version of Mac OS X is it running?
Differences between that Mac and yours will give you a clue to the issue you’re having.
If your Expansion external drive works on that other Mac then you have a chance to copy your data off.
It may be you’ll have to reformat that Expansion Seagate hard drive for your Mac. And then copy your data back onto your external drive.
7. Take Your Drive To A Windows PC
Connect your Expansion hard drive to that PC.
Does it show up there?
It could be you have an NTFS based Expansion drive. Even so, it should show up on your Mac.
Again, you have the chance to copy your data off your drive. Save it somewhere in case you need to reformat your external drive so it shows up on your Mac.
8. Have You Installed Seagate Technology’s ToolKit Software On Your Mac?
And have you upgraded your Mac OS (operating system) version recently?
It may be now the version of the Seagate Toolkit disk management software isn’t compatible with your Mac OS X version.
And as downgrading your Mac operating system is not an easy job. You could be facing the prospect of waiting till a compatible version of the Toolkit software comes out.
Generally, on a Mac, I’d recommend you use the standard software that’s part of your Mac operating system. Because then you know your Mac’s operating system software is always compatible with your Mac.
9. Are You Using NTFS Driver Software For Your Expansion Drive?
When you’re using NTFS driver software on your Mac because your Expansion drive is NTFS formatted.
And you’ve upgraded your Mac OS X. Check the version you have is compatible with your Mac now.
It could be a compatibility issue with your Mac OS causing your Expansion Seagate drive not to show up.
10. Using A USB Hub To Connect Your Expansion To Your Mac?
Your USB hub could be your Mac showing up issue.
Plug your Expansion Seagate drive into another USB port on your hub.
Does your Seagate Expansion external drive show up then?
If you can, plug your Expansion drive directly into your Mac.
If your Expansion USB drive shows up. Then you know your hub caused your Mac issue.
11. Seagate Expansion Drive Not Showing Up Mac Mount Manually
You can use your Mac disk management software – Disk Utility.
And mount your Expansion drive manually.
Start Disk Utility from your Applications Folder > Utilities. You’ll find Disk Utility inside the Utilities folder.
When the Disk Utility window opens. Then set Disk Utility to show all devices.
At the top of your Disk Utility screen look for the view option. And from that menu pick the option to show all devices.
You may need to click on the arrow to the left hand side of your Expansion external hard drive to expand the list.
Look for the eject symbol alongside your Expansion drive’s entry on the expanded list.
Then click on each eject symbol. Wait a few seconds. And check to see if manually mounting makes your Seagate drive show up on your desktop.
Or, click on each of the entries for your Seagate drive in turn. Then click on the Mount button. The Mount button is in the button bar at the top of your open disk utility window.
12. Run Disk Utility First Aid
You can run First Aid on your Expansion drive to check for errors on your USB drive. First Aid will work to repair any errors it finds.
As long as your drive is in Mac OS Extended, APFS (Apple File System). Or ExFAT format you can run Disk Utility First Aid on your hard drive.
Use fix number 11 above, to mount your drive in Disk Utility. Then run First Aid.
Look to the left hand side of your Disk Utility pop up window.
Click on your Expansion external hard drive where you first see it under the External heading. Then click on the First Aid button in Disk Utility’s button bar.
First Aid checks your Expansion drive’s partition map for errors. Disk Utility First Aid checks for bad sectors on your drive and repairs any it finds.
If First Aid doesn’t run the first time you try it. Eject your drive.
Put your Seagate Expansion drive on another USB port on your Mac and run First Aid again.
13. Check Your Seagate Expansion Drive’s Formatting
When you’re having odd problems with your ExFAT Seagate Expansion drive. Sometimes it shows up on your Mac’s desktop. And sometimes it doesn’t. Check your Expansion drive’s format.
I’ve had an ExFAT Expansion drive ship from Seagate Technology. And it’s not quite in the right format to use right away on a Mac.
ExFAT is a file system format that is shareable between a Mac and a Windows PC. But a Mac needs a drive formatted with a GUID Partition Map. Not a Master Boot Record.
You can check on this in Disk Utility. Plug in your Expansion external hard drive. Start up your Mac’s disk management software Disk Utility.
Click on your drive.
If your drive shows ExFAT and Master Boot Record for its Partition Map.
Then the only thing you can do to fix this is to reformat your Expansion drive.
But before you do you must copy any files you want off first.
And after you’ve formatted you can copy your files back on.
You can find out how to format your Seagate expansion in the article on the site.
Seagate Expansion Format For Mac. Simply click the link text to go over to the article.
Then your Expansion hard drive should behave on your Mac.
Tried All The Fixes But Your Expansion Is Still Not Showing Up On Your Mac?
You may then have to face the fact that your Expansion external HDD has failed.
And now you need to consider data recovery.
Indeed, Seagate Technology has its own data recovery service.
There’s no guarantee you’ll recover your data with any data recover service.
The best way for the future is to have a copy of your important files in more than one place.
Because all drives fail eventually. That’s life.
Have a second Expansion drive and have a backup copy of your files on there.
I hope before you reached the end of this article that your Expansion external hard drive. Or SSD drive is showing up on your Mac.
While you’re here, go ahead and check out the other Seagate Expansion articles on the site.
About Simon Irons
As an admin I spend my day helping folks with their Mac issues. From the guy at work, through to unofficial 911 support for family and friends. I swear they have me on speed dial.
For fun I like testing out and playing with new stuff. I think Apple make the best products on the planet.
In my spare time I like to fish and play around with boats.