USB problems with macOS 15
There are reports in various forums about USB problems after the upgrade to Sequoia. Could Apple's stricter security checks be the reason?
macOS 15 Sequoia has been available since September.
(Image: Apple)
After upgrading to macOS 15 alias Sequoia, there may be problems with USB(-C) accessories. This has been reported by affected users on Reddit and in Apple's official support forum. Either devices such as external hard drives or USB sticks are not recognized at all or unwanted connection interruptions (unmount) can occur. Sometimes there are also restrictions on the transfer speed. It is not yet clear how often these problems occur and whether they only occur with special configurations.
Media suddenly not recognized
In Apple's support forum, an owner of an iMac M1 who has just installed Sequoia reports that all his USB flash drives are no longer recognized. However, he had no problems with external SSDs and hard disks. We have also heard from M2 users who are experiencing similar difficulties.
Confusingly, the problem does not occur with all Sequoia machines. Sometimes it helps to carry out a manual mounting via the hard disk utility – but sometimes this is only possible via the terminal. Many of those affected use multiport adapters or hubs, some of which are USB 2.0 accessories. However, it is not possible to determine which devices are particularly affected. M3 Macs are also affected. On Reddit, even chargers are causing problems, and there are also reports of webcams being affected. Particularly problematic: devices are connecting with individual users, only to disappear and reappear again – This means that normal work is not possible.
Several possible explanations
There are currently no reliable explanations as to what is going on with USB(-C) compatibility under macOS 15. All that is known is that Apple has significantly tightened its security checks. This applies, for example, to app access to the local network, which users now have to confirm, and USB devices also have to be approved by users when they are first connected.
macOS 15 may "forget" the permissions in the meantime; however, there are no reports of users having to grant them again. Previous macOS upgrades have also caused USB problems, which Apple then had to resolve with updates.
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