I'd remove the second hard drive from the PC and put it in to a caddy. Boot up, then connect the second hard drive via usb so that you can take off all your documents. Make sure that all docs are available to use, not corrupted, before formatting the usb second drive. Reinstall the second drive physically to the desktop. See if Windows now sees it.
Sony Vaio Z Canvas release date, price and specs: Another Surface Pro rival but for the US