Hi @Fran30732760hbmw, the reason why you saw the Eject option is that it was on a separate drive and not ON your computer.
As I showed you in my screenshots, the only way an "Eject" option can appear is if it is on an external drive. If it's on your hard drive, you will not see the option to Eject.
When you restarted your computer, any drives that you had ejected the day before were ready to remount onto your system (assuming that they were still plugged in).
I have no way of knowing if this is a thumb drive, your camera's card, or a standard external hard drive, but all three of those CAN be ejected. And when they are ejected, they will act just as you described.
Now, you do not need to restart to mount an external drive. You can also unplug and replug the drive into your hard drive. If it is a powered drive (besides having the USB plug, it also has a separate power plug into the drive), you can also unplug and then replug the power back in.
Now, just to make sure, if this was on a camera card, do not do work for images that remain on the camera card. They were not designed for that kind of use. Rather, just take the camera card, plug that into your computer (directly or via a camera card holder), move the images from the card into your computer, back up the new images, AND THEN start working on the images. And, if you want to be properly careful, do not erase the images (in your camera, not on the computer) until you've got two copies of your images (one on your computer and one on a backup drive).
Good luck!
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