I upgraded my laptop/tablet today by adding a M.2 SSD. It was booting from a 1Tb HDD. The M.2 was cloned from a HDD (not the one in the computer). The M.2 was made the boot drive. But now I do not see the HDD. I was wanting to make that the Data drive and all files automatically save to it. But system does not show the HDD. The computer repair store that did the upgrade for me put an icon on the desktop to be able to access the HDD. But why doesn't the computer see the drive, and subsequently doesn't save to it? Any help would be greatly appreciated. BTW, all OS was Windows 10. HELP!