I have a Free Agent external backup hard drive connected to my iMac Intel desktop via USB.  Why do I get an error message, from time to time, upon startup stating: "disk was disconnected improperly, always eject disk before disconnecting"?

I have a Free Agent external backup hard drive connected to my iMac Intel desktop via USB, I never unplug it.  Why do I get an error message, from time to time, upon startup stating, "Disk was disconnected improperly.  Always eject disk before disconnecting."?

I never unplug the external harddrive, and the error message comes up only occassionaly upon startup.  Maybe the USB connection gets disrupted enough to cause the computer to see it as disconnected and then reconnected while the iMac is powered.

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