HD Mounting delay on MacBook Air Post Sonoma update

LaCie external HD takes 8 minutes to mount. The HD is 5TB, 3TB are free. This happens after I updated to MacOS Sonoma. I used the Disk Utility app. already and it shows the LaCie HD to be in good shape. Did a chat with apple tech support and I was told to do a "safe mode start" on it, still bad. After 8 anxious minutes the HD is mounted and it work OK.


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MacBook Air 13″, macOS 10.13

Posted on Oct 4, 2023 1:11 PM

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Posted on Feb 11, 2024 1:09 PM




socialflycatcher wrote:

LaCie external HD takes 8 minutes to mount. The HD is 5TB, 3TB are free. This happens after I updated to MacOS Sonoma. I used the Disk Utility app. already and it shows the LaCie HD to be in good shape. Did a chat with apple tech support and I was told to do a "safe mode start" on it, still bad. After 8 anxious minutes the HD is mounted and it work OK.

Healthy drives should mount in seconds. If you ran Disk Utility and it said the drive was "ok," it is checking the file system, but the drive may have hardware problems. To check for hardware errors, you can use DriveDX.


If ALL external drives take this long to mount, then something is wrong most likely with your Mac, especially if the problem persists in Safe Mode. Another thing to try -- create a new user and log out, then log in as that new user, try under that account. Same problem? Even in Safe Mode?


Another thing you can do. During that 8 minutes mount time, look at Activity Monitor and look for a process with the letters "fsck" in the name of the process. Look under all the tabs in Activity Monitor. If you find such a process, then that means that the MacOS has automatically found problems with the external drive and is automatically running fsck (file system check) to try to resolve them. This can take some ~ minutes, 5 or 10 or more minutes. If you kill that process the drive may mount right away. However in that case, I would not trust the drive, it is appearing faulty to the MacOS.


If other drives mount ok, your drive is likely failing. However to eliminate some possible causes, try a different cable and also do not connect to the Mac through a dock or hub, try connecting directly.


Also, please answer Old Toad's questions, those may shed light.

5 replies
Question marked as Top-ranking reply

Feb 11, 2024 1:09 PM in response to socialflycatcher




socialflycatcher wrote:

LaCie external HD takes 8 minutes to mount. The HD is 5TB, 3TB are free. This happens after I updated to MacOS Sonoma. I used the Disk Utility app. already and it shows the LaCie HD to be in good shape. Did a chat with apple tech support and I was told to do a "safe mode start" on it, still bad. After 8 anxious minutes the HD is mounted and it work OK.

Healthy drives should mount in seconds. If you ran Disk Utility and it said the drive was "ok," it is checking the file system, but the drive may have hardware problems. To check for hardware errors, you can use DriveDX.


If ALL external drives take this long to mount, then something is wrong most likely with your Mac, especially if the problem persists in Safe Mode. Another thing to try -- create a new user and log out, then log in as that new user, try under that account. Same problem? Even in Safe Mode?


Another thing you can do. During that 8 minutes mount time, look at Activity Monitor and look for a process with the letters "fsck" in the name of the process. Look under all the tabs in Activity Monitor. If you find such a process, then that means that the MacOS has automatically found problems with the external drive and is automatically running fsck (file system check) to try to resolve them. This can take some ~ minutes, 5 or 10 or more minutes. If you kill that process the drive may mount right away. However in that case, I would not trust the drive, it is appearing faulty to the MacOS.


If other drives mount ok, your drive is likely failing. However to eliminate some possible causes, try a different cable and also do not connect to the Mac through a dock or hub, try connecting directly.


Also, please answer Old Toad's questions, those may shed light.

Mar 17, 2024 9:58 AM in response to Old Toad

Yes, I did all that!!!

I have to eject the LaCie external hard drive before I shut down the Mac, so next time the Lacie 5TB will mount immediately after turning on the Mac. Otherwise, if I do not eject the LaCie before shutting down, I have to wait 8 minutes for LaCie to show up on screen. Steps taken: ran Disk Utility hundreds of time, new Air Mac, new cables, I use the HD for RAW images storage. This happens also with other brands external portable HD. This doesn't happen with the old "booK" type external drives.

Feb 11, 2024 11:58 AM in response to Old Toad

I have the same problem, it's sooo annoying. Brand new drive, bought on apple website, I assume dit's SSD and I assume it's formatted for Mac. Have a brand-new Mac book pro, the largest one. I can't wait 10 mins for a drive to show up when working. Why is this happening?? I am inclined to return it, but I already copied 3 TB of data on it and that also took days, shockingly. Please help.

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HD Mounting delay on MacBook Air Post Sonoma update

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