How to properly disconnect a MacBook Air from TBolt display?

Hello everyone,
Here is my setup: I have a 13" i5 MacAir, connected to a TBolt display. Also connected to the display I have an Apple USB full size keyboard and my network, plus an USB HDD for TimeMachine. Laptop screen stays closed all the time, so I am basically using only the TBolt as a display.
From time to time, I need to take my Air out to a meeting. I disconnect the power cable, wait for the Air to go in stand-by, then the TBolt cable. Every time, my Mac OS complains that the USB HDD was not properly disconnected and I have to unmount it first. If I would do that, it would mean that each time I reconnect my Air to the display and its power, I would have to unlplug the HDD and replug it, otherwise it would not be mounted back.
Well, is there a way to safely disconnect my Mac from the display and stop the OS complaining? Doesn't Mac OS know to properly handle the situation? It is far from "it just works" in my opinion

Every time, my Mac OS complains that the USB HDD was not properly disconnected and I have to unmount it first. If I would do that, it would mean that each time I reconnect my Air to the display and its power, I would have to unlplug the HDD and replug it, otherwise it would not be mounted back.
Well, is there a way to safely disconnect my Mac from the display and stop the OS complaining? Doesn't Mac OS know to properly handle the situation? It is far from "it just works" in my opinion
Pulling the cable out of a mounted (usb) drive is not the proper way to disconnect it and that is why you are getting the error message. Doing this runs the risk of leaving the drive's file system in an indeterminate state.
The proper way is to unmount it first. Either drag it to the trash or right (control) click on the mounted drive on your desktop and select Eject. If the drive is not showing on your desktop then set the Finder preference (General) to show it.

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