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I just updated my iMac M1 to run Sequoia and now my USB flash drives are not recognized. My external hard drives are recognized as are my external SSD's. I have seen online that I am not the only one with this issue, but nowhere have I found a fix. Is this something that can be fixed or do I have to wait for a update?
iMac 24″, macOS 15.0
This is driving me nuts. After initially updating to Sequoia yesterday on my M2 Macbook Pro, my USB Dongle device initially mounted fine, automatically. Today it won't mount automatically.
It's recognized, in that I can see the device in Disk Utility. However, the button to mount in Disk Utility does not work.
I can only seem to mount the device through Terminal by performing the following steps:
1) Call up the disk utility list
diskutil list
2) Find the DriveIdentifier for the USB device in the list
3) Create a Volume to mount the device:
sudo mkdir /Volumes/YourVolumeName
4)Mount the device to this volume
sudo mount -t msdos /dev/DriveIdentifier /Volumes/YourVolumeName.
It's a USB2.0 device plugged into an apple USB-C multiport adaptor, the drive is FAT32 formatted. Allow Accessories to connect is set to Always. Finder settings are on to show External Disks in Locations on the sidebar.
And the kicker: This same USB device mounts automatically w/o issue on my M1 Mac Studio updated to Sequoia the same day! What gives Apple? Please address this issue ASAP. We should not have to run terminal commands to mount USB drives. This is not a viable work around for users who do not have admin permissions. Thank you.
I'll dig through some other furniture to see if I can find another to test.
Found one. It was ExFAT and mounted just fine.
They ARE encrypted. And strangely, they actually automount about 10% of the time! Intermittent issue! Hard to debug!
The only way it works with this SSD is with the option I mention. If I change to anything else, it doesn't mount.
My external Hard drive is no longer showing as I updated to Sequoia , even my IPhone 15pro doesn’t even show up anymore. This is really frustrating.
i had to buy a usb c adapter and plugged my thumb drive into it and thumb drive worked with this metheod
Exactly, and it’s not my External Hardrive alone, it doesn’t even recognize my IPhone 15 any more, all it does is charge my phone . And it started as soon as I updated.
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my usb is not showing files after updating
BushTurk: What adaptor did you use? None of the ones I have have helped
Updated to Mac OS 15.0.1 still does not fix this issue
Have any of the apple support team seen this post? this is pretty critical.
I did the same, didn't fix it :(
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In my situation there is a LaCie SSD, also not available in Timemachine and not in Finder and Disc-utility
I cheched out in Systeminformation - USD and there Iran see the LaCie drive.
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Mac OS Sequoia not recognizing USB Flash Drives
