Windows 10 & initialising new hard drive


Hello All,
I have built yet another pc for HVS reception and this is my first experience with Windows 10. I have installed the operating system on a 250GB SSD which has been automatically labelled C: I have also installed a large capacity conventional HD for data storage. Now when I try to initialise this disc I get the message '... could not be performed because of an I/O device error' . Is this because the SSD has been assigned 'C' or for some other reason?
Regards, Peter

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