Originally Posted by
Samsung WebPage
Preliminary
* ES Tool (The Drive Diagnostic Utility) is made with the aim of testing a Samsung hard disk drive while it is installed inside a PC, regardless of the status of user's operating system. In fact of the drives returned to Samsung, a large percentage are NTF("No Trouble Found") after testing. So it is strongly recommended to test the drive if it is truly defective by a few fundamental troubleshooting of ES Tool first, to avoid user's unnecessary effort and inconvenience of replacing a good drive.