OK so you have two drives, but are only showing one physical device drive 0
two physical drives I would expect to see as follows...
namely a drive 0 and a drive 1 as in my two drive system
this is where I get confused as your screenshot shows only one drive
all this aside if you wish to delete the EISA partition you will have to go down the route using Diskpart.exe as in my original post. once this partition is deleted you should be able to extend the 19GB OneKey partition into the free space created