imaging

When I image with Acronis I go to My Comp and double click to view C: and folders and files,which is good.
When I use Macrium I double click in My Comp I see a box asking me to assign a letter to Windows or something to that effect. I never saw it before. When that box came up, I was experimenting an put a E: in it. I hope this does not affect me if I have to recover a file or disc.
I used to use the 'cloning' in Macrium but now I use the recommended Intelligent sector copy'.
I thought I used to be able to view my C: and more, in My Comp with Macrium (but could be wrong).
If so, could it be that I switched from cloning to sector copy.
Thank you for any help.