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.
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.
When trying to resuscitate lost drives, I can recommend popular at home rescue programs can be useful to keep the drive mounted while you drag files onto your desktop to retrieve them and/or rescue files. Had less success with bringing drives to 'pro' disk rescue services who were charging well over $1400 to say that once they got to the info on my most important lost drive, that the drive ate itself - and all the info on it. They returned it w/o success or charge along with another drive that I was able to mount on my computer using a full-feature data rescue program. Going forward, make sure to purchase drives with multi-year rescue coverage built in. That has been a good backup while experiencing this problem since 2022.
It's never been fixed, just happened to me after install new software Sequoia 15.4 my external hard drive 2TB disappeared till now from my iMac M1, and in the same usb port I connected another USB flash disk, no problem it shows up... it really pain me.
I just bought a new MacMini and it came with Sequoia. My MacBook Air was on Sonoma, so I upgraded it. Now if I eject any SSD (typically used for TimeMachine), it won't be recognized when I plug it back in UNLESS I reboot with it connected. Frustrating! Never had these issues with Sonoma.
If it is an older HFS formatted drive or one formatted in some Linux filesystem (e.g. Btrfs, ext3, ext4) variant, then it won't be recognized by Sequoia.
Tinx_Lvs_JC wrote: "...Apple - please fix this bug!..."
Apple isn't here — use this form:
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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:
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.
SimplyArt wrote: "Apple! You have been my "rock" (...) Apple, please give us..."
SimplyArt ~ Apple isn't here in these user-to-user communities. Use this form:
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It’s a hub rat has its own AC power plugin,
Might the old one be USB2 & the new ones USB3?
Not a clue. I can tell you that having done absolutely nothing different other than plug it into old laptop first (doubting what I did yesterday), it now works on the new one.
I have a problem where my Mac recognizes the external drive, but the password does not work. I even checked it multiple times from different sources, and one of the sources was the Password Keychain. Has anyone else experienced similar problems?
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.
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.
Sequoia 15.0 bugs - external hard drives
