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
Solved:
I (unfortunately) updated 2 Airs and a Pro to Sequoia and had trouble with them recognizing all external hard drives and flash drives after the update. Luckily I saw a security (hand icon) window flash quickly on one of them as I was plugging a drive in. So I thought it might be a security issue, scrolled down in Settings->Privacy and Security -> Accessories. Setting the option to "Always Allow" makes it work. Setting it to Always Ask does not seem to work since the window just quickly flashes by, not allowing you to confirm access. Enjoy!
After updating my PowerBook (2021 version) to Sequoia 15.5, I can no longer access any external drives (CD/DVD reader, USB hub, thumb drives, etc.). One minute it was fine, next morning after automatic update NOTHING. Important work files unobtainable, what the ****?
I really believe we give Apple a pass on too many issues. Backward compatibility should be a given. `I bought a McBook Pro M3 14 inch and Sequoia has been a nightmare especially as my Time Machine Disk could not be recognised.
My McBook experience is the least pleasant with this iteration than it has ever been for the last 14 years that I am part of this ecosystem of Apple.
Hi Luis - I'm responding to you because of your forum level designation.
I have an M3 MBP running Sequoia 15.5, to which I updated just a few weeks ago. My old external hard drives mount fine, using a USB-C adapter.
What won't mount are several other devices - a numerical keypad, ANY USB 2 flash drives, and now, a brand new USB-C flash drive, which lights up when connected, but does not mount to either desktop or Finder. I hate to just yank it out, because doing that historically risks damaging the accessory, no?
I've tried some of the other suggestions on this thread, but in many cases I can't even find areas of the Finder that others are talking about!
Any suggestions from anyone would be gratefully received.
One other interesting thing: for some reason, I cannot check the Airdrop checkbox in the Finder sidebar, to make it appear in the Finder device list. I wonder whether this is related?
Same problem..... Wish I hadn't updated → really a pain.
The MacBook Air M3 did not recognize the USB after updating to OS Sequoia V15.0. Is there a solution to this problem?
Closely related issue ... when re-booting, my external drive will not auto-mount.
2019 iMac 27-inch; Sequoia 15.0
Any thread dedicated to this issue?
They appear greyed out and will not mount although Time Machine is recognised.
Even using Apple connector does not work.
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!
Correct! I'd probably burn down the house trying to use Terminal.
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.
A Store N Go very old USB is recognised after installation of Sequoia
The external is not recognized the external does not show at all in Disk Utility. That is what is happening.
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.
Mac OS Sequoia not recognizing USB Flash Drives
