That was what I was going to suggest next if the dock was an external of some type.
Hum what I don't get is why it is showing up in DISKPART and not in Computer.
Well lest try another tack downoad and install - it's free and alwasy a real handy tool to have Partition Wizard Best Free Partition Manager Freeware and free partition magic for Windows 7, Windows 8, Windows Vista and Windows XP 32 bit & 64 bit. MiniTool Free Partition Manager Software Home Edition.
< download the free version when installed run it and see what we can come up with.
Now to save yourself taking photos may I suggest you use "snip" it is a feature of Windows so no worries there. I always use it - click Start type in snip > it will give you a blue "window" in that column > right click on it > pin to taskbar.
To use it click on the icon the screen will go milky white place your cursor on the top left hand side of the screen snip you want to take and hold down the left click button drag the cursor across to highlight (it becomes a clear view > when done release the button click on File > save as > name it and select the destination ( I usually use desktop easy to find and clear).
Now when you come to post a reply go to Manage Attachments (little blue box below the reply window click on it > Browse > pick desktop if that is where you have saved the snip > click on the snip > then Upload. the reference will clear when done and then you can post the reply and the snip will come through as my DISKPART did. Sounds complicated but us it often enough and it is real easy and saves you having to upload photos.