I've been using my Simple Touch for 2 months now and have had no previous problems with ejecting the device.
Yesterday, I loaded some library books via ADE, and when I went to eject the Simple Touch, I kept getting the message that the device was in use. ADE was shut down, and the Nook drive itself was not open.
After about 30 minutes, I just removed it manually. This morning, when I went to open one of the books, I got a "user not authorized" error. I followed the steps in a previous post about deleting the Adobe file from the Nook and re-authorizing it. I did that, re-loaded the books, and closed ADE properly.
Am still getting the message that the drive is in use...no matter where I try to eject it--from Start menu or from the icon in the system tray. The only way to get it off was to power down the Nook and then remove it, and I got "user not activated" error again on my downloaded ADE books.
What the heck is going on, and how can I get the Nook to properly eject. I'm running Windows 7 and never had this issue with the Nook 1E or my Nook HD+ tablet.
You can get this kind of error if anti-virus software is scanning the NOOK.
It's also possible if an indexing service (such as exists in Windows) is scanning the NOOK.
There is usually an option to force disconnect.
I had no option to force a disconnet; I had to "forcefully disconnect" by removing the USB cable from the Simple Touch. At least this time, my library books were authorized and I could open them.