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TinRobot

macrumors newbie
Original poster
Nov 26, 2020
5
2
I have a 1TB HDD which works fine as a drive formatted as APFS or Mac OS extended journaled, but when I try to use it as a Time Machine drive, I get error messages and it unmounts the drive and erases it. This happened on two different M1 Macs running Monterey. I've never seen this before and wonder if it is a Monterey thing because it works fine on an older iMac running Mojave. Any idea what's going on?

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