Do you need to format the hard drive and make partitions if you're not installing windows onto the hard drive?

calippoblue

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Jul 23, 2015
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I have a new ssd and i want to delete everything off the Hard drive and start fresh. When i'm choosing which drive my OS should install to do i need to format my hard drive if i'm installing Windows onto the ssd?
 
If you don't format your hard drive , you won't be able to see it at all in windows.Your computer will boot into windows ,but you will see only the SSD storage
Although you can format a secondary HDD dieectly from windows using disk management.
 

But cant you choose which drive is used for the OS?