Naša ovo negde, pa proveri:
Go to properties for the hard drive and select "Polices",
In there you will see "Quick Removal" and "Better Performance".
By default better performance is selected and is the reason you will see the HHD in the safely remove.
Don't worry though as you can't remove it while it's in use anyway. Only a hard drive that is not being used can be removed.
So unless you want to swap it and no longer see it in that list just ignore it and not worry as it's not possible to disconnect your C drive.
Hope this helps,
Sorry if this has already been posted.