This message was posted on behalf of Intel Corporation
Thanks for your interest in the Intel Edison Platform.
You don't need to worry, this is completly normal! The D drive that appears when you connect your OTG port should appear, since it was used before to stock the image. Now, as you know, currently the image is flashed to the the eMMC of the Edison, this change was made due to the amount of storage space in the D drive.
That said, you don't need worry if this D drive appears. Now, I see that you are trying to access your Edison through the D drive using the command prompt. You should know that if you want to access your Edison you have to establish a serial connection, please follow the Step 4 of this guide https://software.intel.com/en-us/get-started-edison-windows-32-step4 in order to do it.
Hope you find this information useful, have a nice day!