If the Threshold is 0 for any attribute, that attribute is not able to predict failure (because the Value cannot be less than 0).ĭevices, which support SMART, may offer a number of self-tests: If this is not true for a critical attribute, failure is predicted, the device is considered bad and it should be replaced immediately (the attribute determines the problem). Worst: the worst (smallest) value ever found in the previous lifetime of the storage deviceĪn attribute is correct, when the Value is greater than or equal with the Threshold. This number is calculated by the algorithm, using the raw data Value: the current relative "health" of the attribute. Threshold: the (failure) limit value for the attribute This data is then processed by an algorithm designed by the storage device manufacturer Data (Raw): raw measured values are stored in this field, provided by a sensor or a counter. Identifier: the meaning of the attribute Each attribute has a raw value, whose meaning is entirely up to the drive manufacturer (but often corresponds to counts or a physical unit, such as degrees Celsius or seconds).Ī S.M.A.R.T. The drive has set of attributes with predefined threshold values beyond which attributes should not pass under normal operation.Įach drive manufacturer defines a set of attributes and sets threshold values beyond which attributes should not pass under normal operation. Attributes, which provide statistics on specific set of attributes. More detail on the health of the drive may be obtained by examining the S.M.A.R.T. The SMART feature set provides the host with the knowledge of a negative reliability condition.Ī drive that implements SMART may optionally implement a number of self-test or maintenance routines, and the results of the tests are kept in the self-test log. SMART feature set devices attempt to predict the likelihood of near-term degradation or fault condition. The Self-Monitoring, Analysis, and Reporting Technology (SMART) feature set allows for the protection of user data and minimizes the likelihood of unscheduled system downtime that may be caused by predictable degradation and/or fault of the device. The purpose of SMART is to warn a user of impending drive failure while there is still time to take action, such as backing up the data or copying the data to a replacement device. When SMART is enabled in the BIOS (mostly default), the BIOS can process information from the storage device and determine whether to send a warning message about potential failure of the storage device. SMART is an interface between the platform's BIOS and the storage device. (Self-Monitoring, Analysis and Reporting Technology often written as SMART) is a monitoring system for computer hard disk drives to detect and report on various indicators of reliability, in the hope of anticipating (predicting) failures.
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