S.M.A.R.T. attribute list (ATA)

This is the list of all known attributes supported by IDE and Serial ATA hard disks. Note: some manufacturers may use the attributes for different purposes also. Attributes not listed here are "vendor specific" attributes (their purpose is not known).

1Raw Read Error RateErrors occured while reading raw data from a disk
Indicate problem with the disk surface or the read/write heads.
Critical attribute
2Throughput PerformanceGeneral throughput performance of the hard disk
Indicate problem with motor, servo or bearings.
3Spin Up TimeTime needed by spindle to spin-up to full RPM
Indicate problem with motor or bearings.
Critical attribute
4Start/Stop CountCount of start/stop cycles of spindle
This value does not directly affect the condition of the drive.
5Reallocated Sector Count
(Reallocated Sectors Count)
Count of sectors moved to the spare area
Indicate problem with the disk surface or the read/write heads.
Critical attribute
6Read Channel MarginMargin of a channel while reading data
The exact function of this attribute is not specified.
7Seek Error RateRate of positioning errors of the read/write heads
Indicate problem with servo, head. High temperature can also cause this problem.
Critical attribute
8Seek Time PerformanceAverage time of seek operations of the heads
Indicate problem with servo.
Critical attribute
9Power-On Time CountTotal time the drive is powered on
The unit of the measure depends on the manufacturer.
10Spin Retry CountRetry count of spin start attempts
Indicate problem with motor, bearings or power supply.
Critical attribute
11Drive Calibration Retry CountNumber of attempts to calibrate a drive
Indicate problem with motor, bearings or power supply.
12Drive Power Cycle CountNumber of complete power on/off cycles
This value does not directly affect the condition of the drive.
13Soft Read Error RateNumber of software read errors
The number of uncorreactable read errors.
190Airflow TemperatureAirflow temperature
The temperature of the air inside the hard disk housing.
191Mechanical ShockCount of problems caused by mechanical shock
Acceleration (for example falling) can cause mechanical shock.
192Power off Retract CycleCount of power off cycles
This value does not directly affect the condition of the drive.
193Load/Unload Cycle CountCount of load/unload cycles
Number of cycles the head moved into landing zone position.
194HDD TemperatureDisk temperature
The temperature inside the hard disk housing.
195Hardware ECC RecoveredCount of correctable errors
Number of errors corrected by the internal error correcting mechanism.
196Reallocation Event CountCount of sector remap operations
Number of all (successful and failed) remap operations.
Critical attribute
197Current Pending Sector CountCount of unstable sectors
These pending sectors may be remapped to the spare area.
Critical attribute
198Off-Line Uncorrectable Sector CountCount of uncorrectable errors when reading/writing
Indicate problem with the disk surface or the read/write heads.
Critical attribute
199Ultra ATA CRC Error CountCount of errors during data transfer between disk and host
Indicate problem with the power supply or data cable.
200Write Error RateErrors occured while writing raw data from a disk
Indicate problem with the disk surface or the read/write heads.
201Soft Read Error RateNumber of software read errors
The number of uncorreactable read errors.
202Data Address Mark ErrorsNumber of data address mark errors
Number of incorrect or invalid address marks.
203Run Out CancelNumber of data correction errors
Invalid error correction checksum found during error correction.
204Soft ECC CorrectionNumber of corrected data errors
Errors corrected by the internal error correction mechanism.
205Thermal Asperity RateNumber of thermal problems
Total number of problems caused by high temperature.
206Flying HeightHead flying height
The height of the disk heads above the disk surface.
207Spin High CurrentCurrent value during spin up
The current needed to spin up the drive.
208Spin BuzzNumber of cycles needed to spin up
The number of retries during spin up because of low current available.
209Offline Seek PerformanceDrive performance during offline operations
The seek performance of the drive during internal self tests.
220Disk ShiftDistance of the disk has shifted relative to the spindle
Incorrect disk spin can be cause by mechanical shock or high temperature.
221G-Sense Error RateNumber of mechanical errors
Number of errors resulting from shock or vibration.
222Loaded HoursNumber of powered on hours
This value is constantly increasing (once per every hour).
223Load/Unload Retry CountNumber of load/unload operations
The number of drive head enters/leaves the data zone.
224Load FrictionMechanical friction rate
The rate of friction between mechanical parts. Indicate problem with the mechanical subsystem of the drive.
226Load-in TimeTotal time the heads are loaded
The time while the read/write heads are in the data zone.
227Torque Amplification CountRate of torque increase
Torque increase during the spin up operation of the hard disk.
228Power-off Retract CountNumber of power off cycles
The number of times the head was retracted as a result of power loss.
230GMR Head AmplitudeHead positioning amplitude
Head moving distances between operations.
231Hard Disk TemperatureDisk temperature
The temperature inside the hard disk housing.
240Head Flying HoursNumber of head positioning hours
Time spent during the positioning of the drive heads.
250Read Error Retry RateNumber of retries during read operations
Number of errors found during reading a sector from disk surface.

S.M.A.R.T. attribute list (SCSI)

This is the list of all known attributes supported by SCSI hard disks. Note: some manufacturers may use the attributes for different purposes also. Attributes not listed here are "vendor specific" attributes (their purpose is not known).

01Buffer over/under run counters
02_0000Write errors corrected without substantial delay
02_0001Write errors corrected with possible delays
02_0002Total write errors
02_0003Total write errors corrected
02_0004Total write errors corrected by algorythm
02_0005Total bytes written
02_0006Total uncorrected write errors
03_0000Read errors corrected by ECC hardware method
03_0001Read errors corrected with possible delays
03_0002Total read errors
03_0003Total read errors corrected
03_0004Total read errors corrected by algorythm
03_0005Total bytes read
03_0006Total uncorrected read errors
04_0000Read reverse errors corrected by ECC hardware method
04_0001Read reverse errors corrected with possible delays
04_0002Total read reverse errors
04_0003Total read reverse errors corrected
04_0004Total read reverse errors corrected by algorythm
04_0005Total bytes read reverse
04_0006Total uncorrected read reverse errors
05_0000Verify errors corrected without substantial delay
05_0001Verify errors corrected with possible delays
05_0002Total verify errors
05_0003Total verify errors corrected
05_0004Total verify errors corrected by algorythm
05_0005Total bytes verified
05_0006Total uncorrected verify errors
06_0000Non medium errors
07Last error event
0BLast deferred error or asynchronous event
0D_0000Temperature
0D_0001Reference temperature
0E_0001Manufacture date (year/week)
0E_0002Accounting date
0E_0003Specified cycle count over device lifetime
0E_0004Accumulated start-stop cycles
0FApplication client parameter data
10Self test results log
18Protocol specific port log
37_0000Blocks sent to initiator
37_0001Blocks received from initiator
37_0002Blocks read from cache and sent to initiator
37_0003I/O commands with size smaller than segment size
37_0004I/O commands with size larger than segment size
3E_0000Power on time
3E_0008Remaining minutes until next internal test