Open the iTunes and go to Edit > Preferences > Advanced, check the Keep iTunes Media folder organized box and click OK. Restart the application and go again to Edit > Preferences > Advanced, click the Change button below the iTunes Media folder location and navigate to the new hard drive where you would like your new Media folder to be created. Select the Make New Folder option, enter a name for the directory and click twice OK. Go to File > Organize/Consolidate Library, check the Consolidate files box and press OK. This feature will copy all all your media files to the new location. After that, drag and drop the original iTunes Media folder to Recycle Bin and restart the application. If you don't receive any error, you can empty the Recycle Bin.