Value is equal to (100 -temp ☌), allowing manufacturer to set a minimum threshold which corresponds to a maximum temperature. If the value is non-zero, you should back up your data.Īirflow temperature on Western Digital HDs (Same as temp. Uncorrected read errors reported to the operating system. This attribute indicates the count of full hard disk power on/off cycles. A decrease of this attribute value is a sign of problems in the hard disk mechanical subsystem. This attribute indicates the number of times recalibration was requested (under the condition that the first attempt was unsuccessful). An increase of this attribute value is a sign of problems in the hard disk mechanical subsystem. This attribute stores a total count of the spin start attempts to reach the fully operational speed under the condition that the first attempt was unsuccessful). The raw value of this attribute shows total count of hours (or minutes, or seconds, depending on manufacturer) in power-on state.Ĭount of retry of spin start attempts. If this attribute is decreasing, it is a sign of problems in the mechanical subsystem.Ĭount of hours in power-on state. More seek errors indicates a worsening condition of a disk surface and the mechanical subsystem.Īverage performance of seek operations of the magnetic heads. If there is a failure in the mechanical positioning system, a servo damage or a thermal widening of the hard disk, seek errors arise. Rate of seek errors of the magnetic heads. The function of this attribute is not specified. However, the more sectors that are reallocated, the more read/write speed will decrease. This is why, on modern hard disks, "bad blocks" cannot be found while testing the surface - all bad blocks are hidden in reallocated sectors. This process is also known as remapping and "reallocated" sectors are called remaps. When the hard drive finds a read/write/verification error, it marks this sector as "reallocated" and transfers data to a special reserved area (spare area). If the value of this attribute is decreasing there is a high probability that there is a problem with the disk.Īverage time of spindle spin up (from zero RPM to fully operational).Ĭount of reallocated sectors. Overall (general) throughput performance of a hard disk drive. Any number indicates a problem with either disk surface or read/write heads. Indicates the rate of hardware read errors that occurred when reading data from a disk surface. In this case, the attribute's raw value will often indicate the actual number of sectors that were reallocated, although vendors are in no way required to adhere to this convention. For example, the "Reallocated Sectors Count" attribute value decreases as the number of reallocated sectors increases. Note that the attribute values are always mapped to the range of 1 to 253 in a way that means higher values are better. These manufacturers do not necessarily agree on precise attribute definitions and measurement units therefore the following list should be regarded as a general reference only. attributes in various products include: Samsung, Seagate, IBM ( Hitachi), Fujitsu, Maxtor, Western Digital. Manufacturers that have supported one or more S.M.A.R.T. Depending on the manufacturer, a value of 100 or 200 will often be chosen as the "normal" value. Each drive manufacturer defines a set of attributes and selects threshold values which attributes should not go below under normal operation.Īttribute values can range from 1 to 253 (1 representing the worst case and 253 representing the best).
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