In the main window you can see the basic information like your hard disk model, serial number, firmware, power on count, power on hours etc. You would also be shown the S.M.A.R.T data of your hard disk. You can see temperature of your hard disk which is blue if under safe value and turns red if is above safe limits. It also shows a big health status block displaying good (in blue color), caution (in yellow color), bad (in red color) or unknown (in gray color). If you have a bad health status, then you should immediately back up your data on the selected hard disk and replace that disk with a new hard disk. If you have more than one hard disk, then you can select one of them to see the information about it.