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).
| 1 | Raw Read Error Rate | Errors occured while reading raw data from a disk
Indicate problem with the disk surface or the read/write heads.
Critical attribute
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| 2 | Throughput Performance | General throughput performance of the hard disk
Indicate problem with motor, servo or bearings.
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| 3 | Spin Up Time | Time needed by spindle to spin-up to full RPM
Indicate problem with motor or bearings.
Critical attribute
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| 4 | Start/Stop Count | Count of start/stop cycles of spindle
This value does not directly affect the condition of the drive.
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| 5 | Reallocated 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
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| 6 | Read Channel Margin | Margin of a channel while reading data
The exact function of this attribute is not specified.
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| 7 | Seek Error Rate | Rate of positioning errors of the read/write heads
Indicate problem with servo, head. High temperature can also cause this problem.
Critical attribute
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| 8 | Seek Time Performance | Average time of seek operations of the heads
Indicate problem with servo.
Critical attribute
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| 9 | Power-On Time Count | Total time the drive is powered on
The unit of the measure depends on the manufacturer.
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| 10 | Spin Retry Count | Retry count of spin start attempts
Indicate problem with motor, bearings or power supply.
Critical attribute
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| 11 | Drive Calibration Retry Count | Number of attempts to calibrate a drive
Indicate problem with motor, bearings or power supply.
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| 12 | Drive Power Cycle Count | Number of complete power on/off cycles
This value does not directly affect the condition of the drive.
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| 13 | Soft Read Error Rate | Number of software read errors
The number of uncorreactable read errors.
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| 184 | End-to-End error | Number of parity errors during transfer between the cache RAM and the host.
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| 187 | Reported Uncorrectable Errors | Errors that could not be recovered using hardware error correction methods.
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| 188 | Command Timeout | Number of aborted operations due to HDD timeout. Value larger than zero may indicate power supply or data cable connection problems.
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| 189 | High Fly Writes | Number of unsafe write operations outside the normal head flying range.
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| 190 | Airflow Temperature | Airflow temperature
The temperature of the air inside the hard disk housing.
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| 191 | Mechanical Shock | Count of problems caused by mechanical shock
Acceleration (for example falling) can cause mechanical shock.
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| 192 | Power off Retract Cycle | Count of power off cycles
This value does not directly affect the condition of the drive.
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| 193 | Load/Unload Cycle Count | Count of load/unload cycles
Number of cycles the head moved into landing zone position.
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| 194 | HDD Temperature | Disk temperature
The temperature inside the hard disk housing.
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| 195 | Hardware ECC Recovered | Count of correctable errors
Number of errors corrected by the internal error correcting mechanism.
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| 196 | Reallocation Event Count | Count of sector remap operations
Number of all (successful and failed) remap operations.
Critical attribute
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| 197 | Current Pending Sector Count | Count of unstable sectors
These pending sectors may be remapped to the spare area.
Critical attribute
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| 198 | Off-Line Uncorrectable Sector Count | Count of uncorrectable errors when reading/writing
Indicate problem with the disk surface or the read/write heads.
Critical attribute
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| 199 | Ultra ATA CRC Error Count | Count of errors during data transfer between disk and host
Indicate problem with the power supply or data cable.
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| 200 | Write Error Rate | Errors occured while writing raw data from a disk
Indicate problem with the disk surface or the read/write heads.
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| 201 | Soft Read Error Rate | Number of software read errors
The number of uncorreactable read errors.
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| 202 | Data Address Mark Errors | Number of data address mark errors
Number of incorrect or invalid address marks.
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| 203 | Run Out Cancel | Number of data correction errors
Invalid error correction checksum found during error correction.
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| 204 | Soft ECC Correction | Number of corrected data errors
Errors corrected by the internal error correction mechanism.
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| 205 | Thermal Asperity Rate | Number of thermal problems
Total number of problems caused by high temperature.
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| 206 | Flying Height | Head flying height
The height of the disk heads above the disk surface.
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| 207 | Spin High Current | Current value during spin up
The current needed to spin up the drive.
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| 208 | Spin Buzz | Number of cycles needed to spin up
The number of retries during spin up because of low current available.
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| 209 | Offline Seek Performance | Drive performance during offline operations
The seek performance of the drive during internal self tests.
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| 211 | Vibration During Write | Vibration encountered during write operations.
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| 212 | Shock During Write | Shock encountered during write operations.
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| 220 | Disk Shift | Distance of the disk has shifted relative to the spindle
Incorrect disk spin can be cause by mechanical shock or high temperature.
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| 221 | G-Sense Error Rate | Number of mechanical errors
Number of errors resulting from shock or vibration.
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| 222 | Loaded Hours | Number of powered on hours
This value is constantly increasing (once per every hour).
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| 223 | Load/Unload Retry Count | Number of load/unload operations
The number of drive head enters/leaves the data zone.
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| 224 | Load Friction | Mechanical friction rate
The rate of friction between mechanical parts. Indicate problem with the mechanical subsystem of the drive.
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| 226 | Load-in Time | Total time the heads are loaded
The time while the read/write heads are in the data zone.
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| 227 | Torque Amplification Count | Rate of torque increase
Torque increase during the spin up operation of the hard disk.
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| 228 | Power-off Retract Count | Number of power off cycles
The number of times the head was retracted as a result of power loss.
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| 230 | GMR Head Amplitude | Head positioning amplitude
Head moving distances between operations.
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| 231 | Hard Disk Temperature | Disk temperature
The temperature inside the hard disk housing.
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| 240 | Head Flying Hours | Number of head positioning hours
Time spent during the positioning of the drive heads.
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| 250 | Read Error Retry Rate | Number of retries during read operations
Number of errors found during reading a sector from disk surface.
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| 254 | Free Fall Event Count | Number of free fall events detected by the accelerometer sensor.
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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).
| 01 | Buffer over/under run counters
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| 02_0000 | Write errors corrected without substantial delay
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| 02_0001 | Write errors corrected with possible delays
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| 02_0002 | Total write errors
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| 02_0003 | Total write errors corrected
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| 02_0004 | Total write errors corrected by algorythm
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| 02_0005 | Total bytes written
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| 02_0006 | Total uncorrected write errors
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| 03_0000 | Read errors corrected by ECC hardware method
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| 03_0001 | Read errors corrected with possible delays
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| 03_0002 | Total read errors
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| 03_0003 | Total read errors corrected
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| 03_0004 | Total read errors corrected by algorythm
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| 03_0005 | Total bytes read
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| 03_0006 | Total uncorrected read errors
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| 04_0000 | Read reverse errors corrected by ECC hardware method
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| 04_0001 | Read reverse errors corrected with possible delays
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| 04_0002 | Total read reverse errors
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| 04_0003 | Total read reverse errors corrected
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| 04_0004 | Total read reverse errors corrected by algorythm
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| 04_0005 | Total bytes read reverse
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| 04_0006 | Total uncorrected read reverse errors
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| 05_0000 | Verify errors corrected without substantial delay
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| 05_0001 | Verify errors corrected with possible delays
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| 05_0002 | Total verify errors
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| 05_0003 | Total verify errors corrected
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| 05_0004 | Total verify errors corrected by algorythm
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| 05_0005 | Total bytes verified
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| 05_0006 | Total uncorrected verify errors
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| 06_0000 | Non medium errors
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| 07 | Last error event
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| 0B | Last deferred error or asynchronous event
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| 0D_0000 | Temperature
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| 0D_0001 | Reference temperature
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| 0E_0001 | Manufacture date (year/week)
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| 0E_0002 | Accounting date
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| 0E_0003 | Specified cycle count over device lifetime
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| 0E_0004 | Accumulated start-stop cycles
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| 0F | Application client parameter data
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| 10 | Self test results log
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| 18 | Protocol specific port log
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| 37_0000 | Blocks sent to initiator
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| 37_0001 | Blocks received from initiator
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| 37_0002 | Blocks read from cache and sent to initiator
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| 37_0003 | I/O commands with size smaller than segment size
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| 37_0004 | I/O commands with size larger than segment size
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| 3E_0000 | Power on time
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| 3E_0008 | Remaining minutes until next internal test
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Introduction