List of S.M.A.R.T. attributes

1Read Error RateFrequency of errors during read operations.
2Throughput PerformanceOverall performance of a device.
3Spin-Up TimeTime required a spindle to spin up to operational speed. This parameter is not used with an SSD, because obviously an SSD has no moving parts.
4Start/Stop CountEstimated remaining life, based on the number of spin-up/spin-down cycles. The value counts down, typically from 100 to 0. The Raw value holds the actual number of cycles.
5Reallocated Sectors CountThe number of the unused spare sectors. When encountering a read/write/check error, a device remaps a bad sector to a "healthy" one taken from a special reserve pool. Normalized value of the attribute decreases as the number of available spares decreases.On a regular hard drive, Raw value indicates the number of remapped sectors, which should normally be zero. On an SSD, the Raw value indicates the number of failed flash memory blocks.
6Read Channel MarginThere is no reliable information available about this attribute.
7Seek Error RateFrequency of the errors during disk head positioning.
8Seek Time PerformanceCharacterizes performance of mechanical seeks of a disk head. An SSD doesn’t use this attribute.
9Power-On Hours CountEstimated remaining lifetime, based on the time a device was powered on. The normalized value decreases over time, typically from 100 to 0. The Raw value shows the actual powered-on time, usually in hours.
10Spin-up RetriesThe Raw value of the attribute shows the number of unsuccessful attempts to spin a spindle up to operational speed. For a rotational drive, this is fairly critical. An SSD does not use this attribute because there is nothing to spin up.
11Calibration RetriesA Raw value typically stores the number of unsuccessful read head and positioning system calibrations.
12Power Cycle CountEstimated remaining life, based on the number of power on/off cycles. The value counts down, typically from 100 to 0. The Raw value holds the actual number of power cycles.
13Soft Read Error RateThere is no certainity about the meaning of this attribute. Some bits of documentation quote this as the number of errors not corrected by ECC and subsequently reported to the host controller. Others conversely say this is the number of errors corrected by ECC.
100Erase/Program CyclesThe total count of erase/program cycles for entire flash memory in its entire lifetime. An SSD has a limit on how many times one can write to it. The exact values depend on a type and make of the flash memory chip.
103Translation Table RebuildThe number of events when internal tables of block addresses were damaged and subsequently rebuilt. The Raw value of this attribute indicates the actual event count.
108Unknown (108)There is no reliable information available about this attribute.
170Reserved Block CountOn an SSD, this attribute describes the state of the reserve block pool. The value of the attribute shows the percentage of the pool remaining. The Raw value sometimes contains the actual number of used reserve blocks.
171Program Fail CountThe number of times when write to a flash memory failed. The write process is technically called "programming the flash memory", hence the attribute name. When the flash memory is worn out, it cannot be written to any longer and becomes read-only. The Raw value shows the actual number of failures.
172Erase Fail CountThe number of times when erase operation on a flash memory failed. The complete write cycle of a flash memory consists of two stages. The memory has to be erased first, and then the data has to be recorded ("programmed") onto the memory. When the flash memory is worn out, it cannot be written to any longer and becomes read-only. The Raw value shows the actual number of failures.
173Wear Leveller Worst Case Erase CountThe maximum number of erase operations performed on a single flash memory block.
174Unexpected Power LossThe number of unexpected power outages when the power was lost before a command to turn off the disk is received. On a hard drive, the lifetime with respect to such shutdowns is much less than in case of normal shutdown. On an SSD, there is a risk of losing the internal state table when an unexpected shutdown occurs.
175Program Fail CountThe number of times when write to a flash memory failed. The write process is technically called "programming the flash memory", hence the attribute name. When the flash memory is worn out, it cannot be written to any longer and becomes read-only. The Raw value shows the actual number of failures.
176Erase Fail CountThe number of times when erase operation on a flash memory failed. The complete write cycle of a flash memory consists of two stages. The memory has to be erased first, and then the data has to be recorded ("programmed") onto the memory. When the flash memory is worn out, it cannot be written to any longer and becomes read-only. The Raw value shows the actual number of failures.
177Wear Leveling CountThe maximum number of erase operations performed on a single flash memory block.
178Used Reserved Block CountOn an SSD, this attribute describes the state of the reserve block pool. The value of the attribute shows the percentage of the pool remaining. The Raw value sometimes contains the actual number of used reserve blocks.
179Used Reserved Block CountOn an SSD, this attribute describes the state of the reserve block pool. The value of the attribute shows the percentage of the pool remaining. The Raw value sometimes contains the actual number of used reserve blocks.
180Unused Reserved Block CountOn SSD, this attribute describes the state of the reserve block pool. The value of the attribute shows the percentage of the pool remaining. The Raw value sometimes contains the actual number of unused reserve blocks.
181Program Fail CountThe number of times when write to a flash memory failed. The write process is technically called "programming the flash memory", hence the attribute name. When the flash memory is worn out, it cannot be written to any longer and becomes read-only. The Raw value shows the actual number of failures.
182Erase Fail CountThe number of times when erase operation on a flash memory failed. The complete write cycle of a flash memory consists of two stages. The memory has to be erased first, and then the data has to be recorded ("programmed") onto the memory. When the flash memory is worn out, it cannot be written to any longer and becomes read-only. The Raw value shows the actual number of failures.
183SATA DownshiftsIndicates how often it was required to decrease the SATA transmission speed (from 6 Gbps to 3 or 1.5 Gbps, or from 3 Gbps to 1.5 Gbps) in order to transfer data successfully. If the attribute value is decreasing, try replacing the SATA cable.
184End-to-End errorThe number of data corruption occurrences in the internal disk cache. The malfunctions of the cache memory, indicated by this attribute, are fairly critical to the proper operation.
185Head StabilityThere is no reliable information available about this attribute.
186Induced Op-Vibration DetectionThere is no reliable information available about this attribute.
187Reported Uncorrectable ErrorsThe number of UNC errors, i.e. read errors which Error Correction Code (ECC) failed to recover.
188Command TimeoutThe number of operations which were interrupted due to HDD timeout.
189High Fly WritesThe number of write errors caused by the fact that a write head was outside normal range of height above disk platter.
190TemperatureTemperature, monitored by a sensor somewhere inside the drive. Raw value typicaly holds the actual temperature (hexadecimal) in its rightmost two digits.
191G-Sense ErrorsIndicates how many times a disk stopped working due to shock or vibration. Typically, this attribute is used in laptop hard drives. In desktop hard drives, sometimes the attribute is listed but never changes, because apparently the vibration detection circuitry is not available.
192Power-Off Retract CyclesThe number of unexpected power outages when the power was lost before a command to turn off the disk is received. On a hard drive, the lifetime with respect to such shutdowns is much less than in case of normal shutdown. On an SSD, there is a risk of losing the internal state table when an unexpected shutdown occurs.
193Load/Unload CyclesThe number of head movement cycles between the data zone and the head parking area or a dedicated unload ramp.The value counts down, typically from 100 to 0. The Raw value typically holds the actual number of cycles.
194TemperatureTemperature, monitored by a sensor somewhere inside the drive. Raw value typicaly holds the actual temperature (hexadecimal) in its rightmost two digits.
195Hardware ECC RecoveredThe number of errors which were corrected using Error Correction Code.
196Reallocation EventsThe total number of reallocation events. This includes both off-line reallocations and reallocations during actual write operations.
197Current Pending SectorsThe number of unstable sectors which are waiting to be re-tested and possibly remapped.
198Off-line UncorrectableThe number of bad sectors which were detected during offline scan of a disk. When idling, a modern disk starts to test itself, the process known as offline scan, in order to detect possible defects in rarely used surface areas.
199UDMA CRC Error RateThe number of errors occurring when transferring data via a cable between a disk and a motherboard port. If the value decreases, try replacing the ATA cable. On Parallel ATA drives, avoid "round" cables.
200Write Error RateRate of errors during write.
201Soft Read ErrorsThere is no certainity about the meaning of this attribute. Some bits of documentation quote this as the number of errors not corrected by ECC and subsequently reported to the host controller. Others conversely say this is the number of errors corrected by ECC.
202Data Address Mark ErrorsThe number of errors encountered when a read head searches for a requested sector.
203Run Out CancelThe number of errors caused by incorrect checksum during the error correction.
204Soft ECC CorrectionsThe number of errors which were corrected using Error Correction Code.
205Thermal Asperity RateA rate at which read errors occur due to short-term temperature fluctuations on a hard drive read head.
206Flying HeightDeviation of a head height above the disk surface from the optimal height value. If a head is too close to the disk surface, there is a risk of mechanical damage. If a head is too far from the disk surface, read/write errors may happen.
207Spin High CurrentAmount of current needed to spin a hard disk up. Only used in rotational hard drives.
209Offline Seek PerformanceCharacterizes performance of seek operations of a disk head measured during an offline scan.
220Disk ShiftDistance the disk has shifted in relation to the theoretical spindle axis due to mechanical damage or overheating.
221G-Sense Error RateIndicates how many times a disk stopped working due to shock or vibration. Typically, this attribute is used in laptop hard drives. In desktop hard drives, sometimes the attribute is listed but never changes, because apparently the vibration detection circuitry is not available.
222Loaded HoursTime a disk head spent in the data zone, rather than in the parking area or on a head ramp. The value counts down, typically from 100 to 0. The Raw value often holds the actual number of hours.
223Load/Unload RetriesThe number of failures when moving a head from the data area to the parking area and vice versa.
224Load FrictionFriction associated with moving a head between the data area and the parking area, especially for the disks with dedicated unload ramp.
225Load/Unload CyclesThe number of head movement cycles between the data zone and the head parking area or a dedicated unload ramp.The value counts down, typically from 100 to 0. The Raw value typically holds the actual number of cycles.
226Load-in TimeTime a disk head spent in the data zone, rather than in the parking area or on a head ramp. The value counts down, typically from 100 to 0. The Raw value often holds the actual number of hours.
227Torque Amplification CountIndicates how many times it was required to use high current to spin a hard disk up or to maintain rotational speed.
228Power-Off RetractsThe number of unexpected power outages when the power was lost before a command to turn off the disk is received. On a hard drive, the lifetime with respect to such shutdowns is much less than in case of normal shutdown. On an SSD, there is a risk of losing the internal state table when an unexpected shutdown occurs.
230GMR Head AmplitudeAmplitude of disk head oscillations.
231TemperatureTemperature, monitored by a sensor somewhere inside the drive. Raw value typicaly holds the actual temperature (hexadecimal) in its rightmost two digits.
232Available Reserved SpaceThe attribute is used in SSDs to denote the remaining reserved space. The value counts down, typically from 100 to 0. The Raw value is vendor-specific.
233Media Wearout IndicatorRemaining flash memory life (on an SSD).
240Head Flying HoursTime a disk head spent in the data zone, rather than in the parking area or on a head ramp. The value counts down, typically from 100 to 0. The Raw value often holds the actual number of hours.
241Total LBAs WrittenThe total number of 512-byte sectors written during the entire lifetime of the device.
242Total LBAs ReadThe total number of 512-byte sectors read during the entire lifetime of the device.
250Read Error Retry RateThere is no reliable information available about this attribute.
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