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!
Connecting the Garmin to a powered hub while the computer was turned off & then powering up didn't make a difference for me.
Yes, it's even weirder: it works exactly once (after the pram reset) and then after that it stops working.
The safe boot didn't work exactly like the normal boot.
I'm on a M2 pro
I'm currently on 15.3.1, and I am still experiencing issues with connectivity. Has anyone found a solution? This is insanity to me.
Interesting-this article Use the ports on your Mac - Apple Support
does specifically say “laptop”…
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Mac OS Sequoia not recognizing USB Flash Drives
