My MacBook Pro 14'' M1 does not recognise any of the 3 USB ports after I upgraded to Tahoe 26.1. I tried other cables reinstalling OS and moving the hard drives between the USB ports. The hard drives can be mounted on other MacBooks Any assistance will be welcomed
MacBook Pro 14″, macOS 26.1
Macs with Apple silicon have protections against attacks from malicious USB and Thunderbolt devices.
if you are connecting device you trust, use
Settings> Privacy & Security > allow accessories to connect
Allow USB and other accessories to connect to your Mac - Apple Support
Macs with Apple silicon have protections against attacks from malicious USB and Thunderbolt devices.
if you are connecting device you trust, use
Settings> Privacy & Security > allow accessories to connect
Allow USB and other accessories to connect to your Mac - Apple Support
In addition to Allow USB and other accessories to connect.........
Go to Finder > Finder Settings.. > make sure that "External disks" are checked in the General and Sidebar Settings.
To add to @Grant's suggestion regarding configure the "Allow Accessories to Connect"......I personally prefer to set it to "Always when unlocked". It will give you the least amount of problems while still maintaining the security of the laptop by having you confirm each device. If you use the other "safe" options, then you will find devices not reconnecting after logging back in from the lock screen, and you are likely to be prompted again for the same device the next time it connects. I have even tried the new default option Tahoe uses, and that default option has issues as well. "Always when unlocked" is the most useful & safe option to select IMHO.
Problem mounting USB ports after installing Tahoe 26.1
