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Can I install windows 10 on local disk D?
And can i install windows 7 sp1 on local disk D too?
And can i install windows 7 sp1 on local disk D too?
What you're calling "disk" "D" is actually a chunk of formatted space on your drive, known as a partition.
So, if the question is, can you install Win10 and Win7 in the same partition, the answer is no.
If you upgraded from 7 you can't run it as well as it was used for the so won't activate unless you have another copy you can run win7 as a virtual machine with the free virtual box