Delete the data from the hard drive.
Delete the data from the hard drive.
What bgibbz said. If this is going to be nothing but a storage drive I'd do a full wipe on it not just a windows factory reset. You can achieve it by diskpart via CMD or go to This PC right click the drive you want to wipe > format > (de-select quick format) > wait patiently for it to finish.
This option in the Reset feature will completely wipe the HDD, after which Windows will reinstall itself. To avoid any data remaining, connect the drive to your new computer and reformat it. For total certainty, consider using a secure erase utility like CCleaner.