21"imac 45 days old - 2tb drive has started not being recognized; receiving a "drive not disconnected properly", though the drive was never disconnected

21"imac 45 days old - 2tb drive has started not being recognized; receiving a "drive not disconnected properly", though the drive was never disconnected

That sounds like a hardware problem.
Backup your data and contact Apple Support or your local AASP to make a service appointment.
Apple - Support - Contact Apple Support
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