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When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.
Sequoia update has caused mounting issues with external hard drives. Ex: had one working and then all of a sudden M3 Max MacBook Pro stops recognizing the device. Now, it won't even find it when it's plugged in. Device works fine on other devices.
This is a USB3 power problem and it's been in Mac OS since Sonoma. I have an M1 MBP and I normally keep an external LaCie dive plugged in to a studio display. Occasionally I take the MacBook on photoshoots and tether to it while simultaneously writing the shots to an external LaCie HDD. Before Sonoma, I never had any problems. After I upgraded to Sonoma the HDD stopped working when plugged directly into the laptop. I took the MacBook and drive to a remote location and suddenly the disk kept randomly disconnecting and disappeared from disk utility when plugged directly into the MBP. When I plugged it into an older MacBook Air with Monterey on it the drive worked perfectly. I connected it the drive to the MBP using a powered USB hub and again, no problems. Sonoma completely screwed up USB power and it sounds like Apple haven't fixed it in Sequoia which is really poor considering there are thousands of reports of this problem. The disk format is irrelevant. Same problems with ExFAT, APFS, MacOS Extended. The only sure fix is to plug the drive in via a powered monitor or USB hub. Just don't get stuck on a photoshoot on a scottish mountain with no mains power and no way of backing up your shots.
Was reading this morning that HFS+ volumes are not supported in Sequoia.
Disk Utility cannot find it. Strange.
All drives I'm using were formatted APFS by my MBP. The drives all mount on my MBP on Monterey (too old to update further). Drives that don't mount in Sequoia didn't mount in Sonoma either. The issue is with the OS, not the drives.
Interesting. I have two SSD's running for backups running with Time Machine and CCC (both are Samsung) and have no problem with either app backing up to them since I upgraded to Sequoia. I don't partition my backup drives.
My Time Machine external hard drive still works, but my three other external disks (Macintosh formatted disks) do not show up on my desktop or in disk utility. Spent hours on the phone with Apple support - tried most everything with no result. Booted up in safe mode, booted up in test user, restarted several times, disconnect and reconnect the disks, etc. No result. These disks worked fine before Sequoia. Naturally, the Apple technician said it was a hardware issue with the disks - very Microsoft of him. Suspect a software issue.
the problem of usb ports and disks is a long-standing issue. especially when inheriting older operating systems. one must also consider that the jump to a new operating system version, which, in my humble opinion, is still quite immature, is never recommended until after at least two minor versions have been released. Taking advantage of new operating systems at launch must be the prerogative of those who do so for testing and evaluation, not for normal use, unless they are aware that there are problems just around the corner or with the specific aim of formulating precise and careful feedback to present to the developer in order for the problems to be resolved.
Having said that, in such cases, I would suggest making a backup of data on an external disk, reinstalling the operating system with a complete reset, even better if to the previous version, and, reinstalling the software by transferring your data.
I found this thread when my new M4 Macbook Pro would not recognize an external SSD. Works fine on Ventura on another Macbook Pro. Did not show up on Sequoia 15.1, nor did it show up in Disk Utility. This was the change that fixed it. Changed to Always and immediately it showed up. Plus 1000 for this tip. Thanks!
Edit: I replied to AlWeir who suggested in Settings: Privacy and Security > Allow Accessories to Connect. That was the tip that fixed it. Thanks!
Hello, I’d just like to confirm the mention of “ext4” not being compatible with Sequoia. Would this be for locally connected drives or all drives i.e NAS? The reason I’m bringing this up is that Synology suggests that “EXT4 is for speed, NTFS for easy compatibility with Windows. Forget about the rest.” I have 16 TB of Synology storage running ext4 connected to my M1 MacBook Pro running Sonoma with no issues. Just looking down before I step in it.
It was connected and working fine then just stopped displaying. Allow accessories to connect is enabled for “always” so no disk utilities is not finding it now.
Eye roll! My external drive works perfectly on my husband's updated iPad with no issue.
I've got the same issu with my I Mac and an external HDD. It stopped at 47-48% of the backing or stopped by itself!
Bad news. I'm not able to get a entire Bckup for my puter .
Worked for me. Thanks.
I have same problem with my MacBook Air M1. I recently upgraded to Sequoia and now I get Lacie Hard disk cannot be found.
Sequoia 15.0 bugs - external hard drives
