Hi,I have updated to Monterey on my late 2015 27" iMac. This morning on start up from an external SSD it refused to start and eventually after going back to the internal disk I have a message to say that the disk is using features not supported. A disk utility check shows both the start up SSD and my external Seagate drive including Time Machine seem to have lost their SMART status and when I try to go into Time Machine no older back ups are available so going back and reinstalling an older back up doesn't want to work. Anybody out there with any suggestions?
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Monterey Update has disabled external disks
- Thread starter thcaef
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This is why I wait 7 months before downloading any new OS
Are you using those external drives "through a hub"?
See:
forums.macrumors.com
See:
macOS Monterey Users Report Connectivity Issues With USB Hubs
Some Mac users who upgraded to macOS Monterey this week are experiencing problems getting USB hubs and other USB-based devices to work properly with their machines, based on scattered online reports. There have been several reports on Reddit, Apple's Developer Forums, and Apple's Support...
forums.macrumors.com