If its value increases, it's an indication of HDD or SSD wear.Ĭurrent Pending Sector Count. This attribute reflects the number of times a remapping has happened. Reallocation happens when the drive's logic remaps a damaged sector, as a result of recurring soft or hard errors, to a new physical sector from its spare ones. The two above mentioned studies on hard drive failure rates and other sources agree that an important help in identifying failing drives are: attributes are critical for failure prediction. How to use SMART to predict the failure of an HDD or SSD (essential values to check) Also, remember that, usually, smaller values are an indication of a decrease in reliability. attribute, check the values of these three fields: value, threshold, and flags. When trying to understand the status of any S.M.A.R.T. SMART attributes are described by data such as their ID, current value, worst value, and threshold Each of the attributes is either critical and can predict an imminent failure (for example, ID 5 reallocated sectors count), or statistical with no direct effect on status (for example, ID 174 unexpected power loss count). This is usually set by the manufacturer and therefore varies from drive to drive. Its contents depend on the attribute and the maker of the drive. This is the data used by the algorithm designed by the manufacturer of the HDD or SSD. Data: raw measured values provided by a sensor or a counter.Worst: the smallest value of the attribute ever recorded.A new hard drive should have a high number, the theoretical maximum (100, 200, or 253 depending on the manufacturer), that decreases during its lifetime. The algorithm calculates this number based upon the raw data. Value: current value of the attribute.If this value is reached, then your drive is about to fail. Threshold: the minimum value for the attribute.Still, all disk monitoring and testing tools provide the name and a textual description of the attribute. It usually has a standard meaning, and it is marked with a number between 1 and 250 (for example, 9 is Power-on Count). Identifier: the definition of the attribute. ![]() In any SMART monitoring program, you should see attributes that contain at least some of these fields: Also, they don't explain which of the various attributes or variables are worth our attention, making us drown in data.īefore attempting to understand which SMART attributes are relevant, we first have to differentiate between the main types of SSD and HDD failures: predictable and non-predictable. For example, some manufacturers store power on-time data as hours, while others measure it in minutes or seconds. Still, there are many inconsistencies in the statistics because many of the hard drive manufacturers use different definitions and measurements. The system provides a great deal of internal data. However, know that, apart from some singular attempts ( Google, Backblaze), most of the S.M.A.R.T. If you want to get an in-depth idea of all the SMART attributes, as there are about 50 of them (raw read error rate, spin-up time, reported uncorrectable errors, power-on time, load cycle count, etc.), visit this webpage. SMART keeps track of a series of variables whose number and type vary from drive to drive, which are indicators of its reliability. □ What it does is an entirely different story, though. How does SMART do that? You might be tempted to think that SMART can magically guess if your drive is healthy. That means, plainly speaking, that SMART should supposedly be able to tell you if your hard drive or solid-state drive is about to stop working!ĭrive health information is provided by SMART SMART was invented because computers needed something that could monitor the health state of their hard drives. It is independent of your operating system, BIOS, or other software. SMART, also written as S.M.A.R.T., is a technology found inside HDDs and SSDs. Its clever name is actually an acronym for Self-Monitoring, Analysis, and Reporting Technology. SMART is a system that monitors the internal information of your drive. Is there anything else you would like to know about SSD and HDD SMART?.How to use SMART to predict the failure of an HDD or SSD (essential values to check).How to read SMART values and attributes.
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