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 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.
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 was having disconnects regularly and then I thought I would try an old 10Gbps NVMe enclosure I had spare and so far, 5 days and not a single disconnect. The drive is working fine no matter how much load I put on it.
My ORICO 40Gbps enclosure is the one causing my problems. I don't know if it is some sort of mismatch between the enclosure and the WD NVMe or the ports on the Mac Mini M4 running Sequoia 15.2 just can't handle the transfer speed etc but for now at least everything is working. And oddly enough my other Lacie 1TB SATA drive which is in USB enclosure has also stopped disconnecting. I have not updated the OS since all the problems.
Solution for SSDS on M4 Pro: Format external drive to ExFAT, and drives return to normal to normalish speeds.
So I had the same or a similar issue that could be resolved with the Apple Support Team.
Situation: Abysmally slow external SSDs (worst case 8MB/s write) connected directly to USB C port to MacBook Pro 16" M4 Pro but were fast on MacBook Pro 16" Intel?!? My Samsung T7 randomly ejected on my old MacBook but not on my new one!?! Bro idk...😀🥲😭
Hope this might help some of you 🥺
Kindest regards
Stranger on the interwebs
A solution that helped me with SSDS on M4 Pro: Format external drive to ExFAT, and drives return to normal to normalish speeds.
So I had the same or a similar issue that could be resolved with the Apple Support Team.
Situation: Abysmally slow external SSDs (worst case 8MB/s write) connected directly to USB C port to MacBook Pro 16" M4 Pro but were fast on MacBook Pro 16" Intel?!? My Samsung T7 randomly ejected on my old MacBook but not on my new one!?! Bro idk...😀🥲😭
Hope this might help some of you 🥺
Kindest regards
Stranger on the interwebs
I was so hoping my first failed external hard drive would open after upgrading to 15.3.1, but the "invalid node" structure is preventing it from opening. Was hoping for a miracle but it's just a failed HD. The new SanDisk external is working fine.
TLDR; Try a new micro-B USB cable. Seriously, that fixed it for me...
Got a brand new mac mini M4 pro delivered yesterday. Backed up to my time machine on my old iMac. Tried using that in migration assistant on the new mac mini... hmm, that's odd it's not finding the drive when plugged into an apple adapter. Just migrated via wi-fi instead. Plugged the time machine drive back into the old iMac and it was also not mounting. Hmm, I guess it could have gone bad but the timing is very suspect. Plugged it into a PC to check whether the drive was cooked and it was mounting and formatting fine. As a last resort, tried another cable I had laying around and it mounted instantly. It seems to only be an issue with micro-B USB cables, at least anecdotally. If your drive is using micro-B, try or buy another cable and hopefully it fixes your issues. Cheers
System Settings>General>About, scroll down, System Report>Hardware>USB, what mA are used & available?
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.
Worked for me. Thanks.
Latest Sequoia update has sorted the port problem for external hard drive - YAY!
Nope it don’t help
sorry
This option is only for laptop Macs
Sequoia 15.0 bugs - external hard drives
