millerbc182 Author

Level 1

11 points

USB Devices Disconnected

I have recently begun to see this error message and have not been able to determine which USB device this is referring to. I have an 27" 2020 iMac that has a fair number of USB devices attached (CalDigit dock, storage devices) some of which are powered through a Cyberpower USP. I've tried resetting the SMC but that did not resolve the problem. How can I determine which USB is causing the problem?

iMac 27″, macOS 12.2

Posted on Jan 20, 2022 6:17 AM

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4 replies

Level 6

13,964 points

Jan 20, 2022 7:35 AM in response to millerbc182

Could you please post a snapshot of your Energy Saver Preferences?

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Level 10

91,234 points

Jan 20, 2022 7:40 AM in response to millerbc182

The external drive(s) that disconnected, will no longer show up in Finder or on your Desktop.

Plus if you open Disk Utility, you can see unmounted drives in the list of external drives.

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Level 6

13,964 points

Jan 20, 2022 9:26 AM in response to millerbc182

Uncheck “Put” and “Wake” and check “Prevent”, might resolve.

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millerbc182 Author

Level 1

11 points

Jan 20, 2022 7:44 AM in response to hcsitas

Sure

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USB Devices Disconnected

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