![]() You can use this tool to check your drives regularly to detect failures, to check an used drive that you want to buy and for other purposes. If you know how to do that, you're ready to go, and if not, there is a lot of documentation over the internet! As I've showed you, the software is very intuitive, the only thing that you have to know is how to interpret SMART. This practical tool can help you to check your drive status in an easy way. You can also go to Self-test Logs tab and check the results. After that, the result will be displayed under the progress bar. If you want to perform one, just go to Perform Tests tab, select the text type, and execute it. Launch Terminal and at the prompt, type diskutil list and press Return. ![]() They may take longer if the drive is not idle, and you won't be able to check SMART data while running them. If you ran the installation noted above, smartmontools will be on your Mac for you to use whenever you want. They are safe and can be done during normal system conditions. You can perform some tests to recognize drive faults. You should check your drive's user manual first so as to know how to read Normalized, Raw, and other values (the interpretation may vary depending on the manufacturer). Those are some important attributes, you can see them all on SMART Wikipedia page. This attribute is for HDDs, and the higher value denotes that it may be suffering a mechanical problem. When a spin start is unsuccessful, this counts the attempts done to do a full-speed spin start.
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