Announcement: Upgrade to macOS Mojave

With features like Dark Mode, Stacks, and four new built-in apps, macOS Mojave helps you get more out of every click. 
Find out how to upgrade to macOS Mojave > https://support.apple.com/macos/mojave

Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

Question:

Question: External hard drive won't mount in high sierra

Is something broken in High Sierra when it comes to external USB HDs? Did something break in the USB stack?


Up until installing High Sierra I have been able to mount my external USB hard-drive with my MacBook Air. I now try connecting it and it will not longer mount. It isn't even listed in the USB devices section, when I check "System Information".


Originally I thought the drive was broken, but I did some digging and none of my Seagate drives will mount. Same issue with all of them (I have three Seagate drives: 2 FreeAgent GoFlex and 1 Backup Plus Portable Drive). They don't appear in the list of USB devices and no LED activity of the drives. They are all USB 3.0 based drives.


They all work on my old Mac Mini, which is running macOS 10.11.6. Two of the drives are HFS+ and the other is NTFS.


An older USB 2.0 based drive mount fine.


I am using macOS 10.13.1 on the MacBook Air.

MacBook Air, macOS High Sierra (10.13.1), null

Posted on

Reply
Question marked as Helpful

Nov 12, 2017 2:21 PM in response to Andre John Mas In response to Andre John Mas

Had similar issue. Open disk utilities. If none of these drives show up look for the menu (new in High Sierra) that states "show all". If drive shows up try repair and if that does not work you may need to reformat it if nothing on that needs saving. I had two drives that I needed to fix that way. They were both fine with Sierra but High Sierra must be doing something different.

Question marked as Helpful

Dec 18, 2017 9:34 AM in response to Andre John Mas In response to Andre John Mas

I have the same problem. I have the very newest MacBook Pro, my WD External hard drives won't mount. In Disk Utilities, the drives are visible, however, "first aid" is unsuccessful and they won't reformat either. In my case, the lights on the external drive flash, and you can hear the internal discs spinning normally.

Question marked as Helpful

Dec 18, 2017 7:01 PM in response to Andre John Mas In response to Andre John Mas

I don't believe it has anything to do with USB. It doesn't work for me when using both USB and Thunderbolt. After some digging, I think it all has to do with High Sierra and APFS. High Sierra is deemed one of the worst OSX updates in Apple's history and it could be simply just a lack of support for spinning HDD drives and that's why nothing will mount. Unfortunately, that makes this a waiting game for an update to fix all of this due to Apple leaving HFS+ and going to APFS.

Question marked as Helpful

Dec 25, 2017 5:22 PM in response to Csound1 In response to Csound1

HS has about turned a 10 + year Mac user against them. I have lost so much time and money it's pitiful. If they don't get their junk together I will be selling a Macbook Pro, 27" iMac, iPad Pro and 2 new iPhone 8s and going to PC and android. Ever since Steve Jobs passed the company is going to the dogs. Get your act together Apple!

Question marked as Helpful

Nov 12, 2017 9:58 PM in response to tbirdvet In response to tbirdvet

The problem is the drives don't even show up as USB devices in "System Information", so nothing else in the OS is going to know about it. I did check with "Disk Utility" as suggested, and none of the drives are listed, as suspected.


I did try creating a Sierra recovery disk, but that did not result in a mounting disk. This makes me wonder whether 10.13 installed new firmware as part of the update process, which I suspect it did to support APFS? The 'boot rom version' indicated is MBA61.0103.B00 and the 'smc version' is 2.13f15. Mac model is 'MacBookAir6,2'.


Just tried reseting the NVRAM, but that did not make a difference.

There’s more to the conversation

Read all replies

Page content loaded

Question marked as Helpful

Nov 12, 2017 2:21 PM in response to Andre John Mas In response to Andre John Mas

Had similar issue. Open disk utilities. If none of these drives show up look for the menu (new in High Sierra) that states "show all". If drive shows up try repair and if that does not work you may need to reformat it if nothing on that needs saving. I had two drives that I needed to fix that way. They were both fine with Sierra but High Sierra must be doing something different.

Nov 12, 2017 2:21 PM

Reply Helpful (7)
Question marked as Helpful

Nov 12, 2017 9:58 PM in response to tbirdvet In response to tbirdvet

The problem is the drives don't even show up as USB devices in "System Information", so nothing else in the OS is going to know about it. I did check with "Disk Utility" as suggested, and none of the drives are listed, as suspected.


I did try creating a Sierra recovery disk, but that did not result in a mounting disk. This makes me wonder whether 10.13 installed new firmware as part of the update process, which I suspect it did to support APFS? The 'boot rom version' indicated is MBA61.0103.B00 and the 'smc version' is 2.13f15. Mac model is 'MacBookAir6,2'.


Just tried reseting the NVRAM, but that did not make a difference.

Nov 12, 2017 9:58 PM

Reply Helpful (6)

Nov 14, 2017 7:03 AM in response to Andre John Mas In response to Andre John Mas

Further investigation suggests that maybe the power levels are no longer being negotiated properly (these are 2.5" external bus powered drives)?


My reasoning is based on the following: When I plug in the drive straight into the Mac no drive lights appear and it is not even recognised as a USB device, when checked via "System Information". On the other hand, if I plug the drives individually, into my D-Link DUB-H7 USB 2.0 hub then they gets recognised as a USB device and even mounts.

Nov 14, 2017 7:03 AM

Reply Helpful (2)
Question marked as Helpful

Dec 18, 2017 9:34 AM in response to Andre John Mas In response to Andre John Mas

I have the same problem. I have the very newest MacBook Pro, my WD External hard drives won't mount. In Disk Utilities, the drives are visible, however, "first aid" is unsuccessful and they won't reformat either. In my case, the lights on the external drive flash, and you can hear the internal discs spinning normally.

Dec 18, 2017 9:34 AM

Reply Helpful (7)
Question marked as Helpful

Dec 18, 2017 7:01 PM in response to Andre John Mas In response to Andre John Mas

I don't believe it has anything to do with USB. It doesn't work for me when using both USB and Thunderbolt. After some digging, I think it all has to do with High Sierra and APFS. High Sierra is deemed one of the worst OSX updates in Apple's history and it could be simply just a lack of support for spinning HDD drives and that's why nothing will mount. Unfortunately, that makes this a waiting game for an update to fix all of this due to Apple leaving HFS+ and going to APFS.

Dec 18, 2017 7:01 PM

Reply Helpful (7)
Question marked as Helpful

Dec 25, 2017 5:22 PM in response to Csound1 In response to Csound1

HS has about turned a 10 + year Mac user against them. I have lost so much time and money it's pitiful. If they don't get their junk together I will be selling a Macbook Pro, 27" iMac, iPad Pro and 2 new iPhone 8s and going to PC and android. Ever since Steve Jobs passed the company is going to the dogs. Get your act together Apple!

Dec 25, 2017 5:22 PM

Reply Helpful (7)

Dec 31, 2017 11:59 AM in response to Mashoo811 In response to Mashoo811

When you are in DU, look in upper left corner an there should be a View option. click on that and you should get an option to Show All Devices. THAT was the key for me as DU then recognized my new external hd and I was able to format and partition it as I wanted.

Dec 31, 2017 11:59 AM

Reply Helpful (4)

Dec 31, 2017 12:00 PM in response to Andre John Mas In response to Andre John Mas

When you are in DU, look in upper left corner an there should be a View option. click on that and you should get an option to Show All Devices. THAT was the key for me as DU then recognized my new external hd and I was able to format and partition it as I wanted.

Dec 31, 2017 12:00 PM

Reply Helpful (1)
User profile for user: Andre John Mas

Question: External hard drive won't mount in high sierra