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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.
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.
In my case, since I installed Sequoia, I can hardly ever eject any flash memory. It always tells me that I can't because they are in use by some other program. I have to force eject or shut down the laptop. With every upgrade I see Apple's quality and confidence drop a lot!
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 .
I have same problem with my MacBook Air M1. I recently upgraded to Sequoia and now I get Lacie Hard disk cannot be found.
Same problem, exFAT not working normally, super slow responses
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.
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.
Year after year, even after previously fixed, I have had the same problems with Time Machine and inability to write to external SSDs.
I have posted over and over, year after year, yet never a permanent solution, there must be no profit to be made by actually solving it.
I am glad to hear that you found solutions for your problem. However, none of them apply to any of my years-long, recurring external drive mounting issues. Which year after year appear to be solved via an OS update only, later, to be resurrected with each new operating system. That’s software engineering.
A work around: Select Finder: GO: Computer:
You should see the mounted external drives which you can then use in the normal manner.
Its a Bug in OS 15.2 that doesn't allow this to show up in the finder side bar nor in the desktop even when these defaults are selected in the Finder Sidebar settings.
Time Machine constantly issues an error message that, since Sonoma 15.0, it cannot write to my external SSD.
All day, every day, every Apple device, constant problems (new and very old).
Demand Apple write good software like it did before T.C.
Ok you may be on to something here. I just now realized when we upgraded my Mom's M2 she jumped about 2-3 OS upgrades to Ventura and used Apple's migration tools. My M4 mini jumped from High Sierra on 2011 Macbook Pro to Sequoia. So I almost wonder if starting over from scratch would fix this? I really want that to be a last resort, because I'd have to move all my mail data, fonts and other stuff by hand. But maybe it's old software fighting with new software? I do clean up preferences, caches and preference panes whenever possible. I have my new backup SSD working, so I think I'll give this a shot to see if it works.
After scouring the internet, talking with Apple and OWC, I finally got a powered Hub and my RAID popped right up no issues at all.
So thats the fix id recommend to anyone else who was utterly frustrated by this.
Got a cheap powered 7 port Hub and everything works as it should.
Good luck
I've been troubleshooting this, and here's what I've found. (On a Mac mini M4, running Sequoia 15.2; Mediasonic Probox enclosure with 4 bays housing spinning drives and an SSD. Everything stopped working sometime between 15.0 and 15.1.1)
If I run my Probox (JBOD) with just one SSD, it mounts just fine. The moment I add an HDD, everything goes belly-up. Since this is a wall-powered unit, clearly it is not the power drawn that is the problem. I had suspected the interface with the Probox being incompatible with something in Apple's new hardware implementation, but that is now ruled out. What remains is clearly the older drives themselves.
I also have a Seagate 2.5" Expansion HDD which is mounting when connected (it's another matter that the disk is terminally ill). But other 2.5's do not mount when in the Probox, so I don't really know what to make of this bit of info.
carlamm wrote: "...APPLE DO SOMETHING!"
carlamm ~ Apple isn't here in these user-to-user communities. Instead:
Contact - Official Apple Support
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Bring up the Info pane for the drive - Control (right) - click and select Get Info. That will tell you what the format is:
Sequoia 15.0 bugs - external hard drives
