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.
Same here: after Sequoia update, randomly I can't "ejects" external drivers (all types)
Someone said that updating to 15.2 sorted the problem. I am on a Mac Mini M4 with Sequoia 15.2 and it hasn't sorted it for me.
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.
Follow-up. Apple was able to help me re-format the SanDisk, which after doing so, the SanDisk did appear on my desktop. We then chose the SanDisk to use for Time Machine auto backups, and this time, Apple had me TURN OFF the "encryption" choice at the time of setting the external up to use for Time Machine.
The external drive has been working for 24 hours, and Apple will follow-up with me tomorrow and then again at a later date.
SanDisk technical support had also suggested it was an encryption error that Apple would need to be notified. All good today! It was ironic that my previous external failed, and the new one failed in the same week but so far so good.
pianoplayah wrote: "...Apple, please fix this!..."
pianoplayah ~ Apple isn't here in these user-to-user communities. Instead:
Contact - Official Apple Support
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What I have been doing since this issue is:
Annoying but that's what's been my resolution so far until Apple does the right thing.
Can Disk Utility find it?
Privacy & Security>Allow Accessories To Connect
The problem is that this menu option no longer exists in Sequoia 15.1.1
Yes! I can verify that this IS a USB problem. Ever since I purchased a new external drive that has a USB hub and interfaces with my new MacbookPro M3 via USB 3.2 I have had issues with the drive not mounting. The drive mounts fine to my older MacbookPro with Intel chip. This is a 2-bay OWC expansion drive with an external power supply. Brand new. And again, it works/worked fine with the older, Intel-based MacbookPro.
In an effort to solve the problem, I upgraded the new MacbookPro to the latest version of Sonoma (it was running Sonoma, as was my Intel MacbookPro) and that seemed to solve the problem...the drive mounted. ONLY THIS LASTED JUST 3 DAYS and then it stopped again.
To make a long story short, I tried all of the safe boot, etc. suggestions and nothing worked. I ultimately (today) upgraded to Sequoia 15.3 figuring that if I took the machine into Apple, they'd demand that anyway. Still no go UNTIL I read this thread, and decided to try connecting the external drive to the MacbookPro via an old USB C to USB 3.0 cable plugged into a dongle that was then connected to the M3 Macbookpro...and IT WORKED. Drives mounted right up and a TimeMachine backup is running. System Info tells me that it believes that I have a USB 2.1 Hub Installed. (see image)
It of course remains to be seen if this continues to work (recall that I did have it working for a few days on Sonoma until it stopped...that was with a USB C 3.2 connection on the drive to USB C on the M3 Macbookpro connection). But there definitely seems to be something going on with this machine and its USB ports (yes, I tried all 3 ports earlier before the current "fix" and none of them allowed the drive to mount).
Downgrading to a USB 2.1 (or presumably older?) connection seems to work. FWIW.
Apple! You have been my "rock" since the 1980's. My rear window carries the apple sticker because I've made a living off of my Apple computers.
I just turned 70...and purchased what may be my last Apple. A new 27" monitor, and a new iMac Studio with plenty of ram to run Adobe software, so I can continue to create graphics, and stay up to date with the OS.
The new iMac started glitching. Bright magenta screen, Adobe programs going blank, having to restart continually. My external used for Time Machine backup was full of older art files as well...so I also worked with an Apple specialist who after hours of investigating (which included re-installing the OS) realized my external was failing. I tried to mount the external to my 2017 iMac with Ventura OS, (which had worked fine for several years) and it will not mount.
However, my new iMac seems to be working fine since removing the external hard drive.
I chalked it up to the external failing. Did some investigating on recovery methods, and it most likely will need to be shipped out at great cost to get those older files off of it.
Last week I purchased a new SanDisk Extreme 2TB for Time Machine backups. It worked for 3 days. I checked it yesterday, and have a new message that says: The disk “My Backup” can’t be unlocked. A problem was detected with the disk that prevents it from being unlocked. Attached is a snapshot of the new external Disk First Aid check.
I have reached out to the Apple technician who is familiar with my former case, and am still waiting to hear from him.
Apple, please give us all an update on this BUG. Steve Jobs would not be happy right now. Neither am I. Apple is costing us money instead of making us money.
I have a new external hard drive which is formatted in the format which only works on mac computers (I can't check what the format is as its not appearing in disk utility or finder)
Is the best option just to downgrade from Sequoia? or will an update be released quite quickly? I have very important data stored on this drive.
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.
My Time Machine drive got messed up. I think something happened when the the disk was attached and then crashed the computer. Luckily I was able to retrieve my files from a backup on the Time Machine from the week before. Sedona shows the disk but at this point the drive is unsafe to use. I will stick with Sedona until Mac fixes this problem. Nice to know I’m not the only one having these problems.
Today, 12/19/24 online magazine 9to5Mac released an article about multiple (?) bugs in MacOS Sequoia 15.2 affecting Time Machine, Carbon Copy Cloner, SuperDuper! and possibly other backup utilities.
I use both Time Machine and CCC and can confirm the bugs are much, much older than Sequoia 15.2 (by years).
I suggest you read it. It’s called “MacOS Sequoia 15.2 Backup Bug(s)…” posted 12/19/2024. Good Luck and Merry Christmas!
Same problem for me. Multiple older backup HDDs are not seen by the system, including Disk Utility. My backups are two weeks out of date, as of this message. For me the problem was not linked to an upgrade or a dot version OS update. I bought a new Mac Mini M4 in late November. External drives mounted fine, and both Time Machine and CCC ran normally. Sometime over the evening of Dec. 31, it all stopped. I had been on 15.1.1 for over a month, and was yet to update to 15.2. Why the failure happened without any evident change in the OS is a mystery. Having spent a fair bit on the Mini and monitor/peripherals, I am loath to buy backup disks, so this is missing piece is critical for me.
A knock wood update:
Since I decomissioned both of my USB-C external drives (one exclusively for Photos, the other for Time Machine backups), I haven't had any kernal panics. None.
As I mentioned above, I am currently using an old Seagate USB 2.0 drive to do Time Machine's dirty work. It backs up hourly with no issues, and in under a minute and a half generally. In other words, it works.
This is, in my opinion, Apple's buggy implementation of USB-C in Sequoia/Sonoma. (Upon reflection, the Time Machine backups taking way too long may have begun in Sonoma.) Likely a software implementation issue, in my opinion. They need to fix this ASAP. (And yes, I have reported the issue to Apple.)
Sequoia 15.0 bugs - external hard drives
