S.M.A.R.T. attributes (ATA)

 

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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

Errors occured while reading raw data from a disk

Indicate problem with the disk surface or the read/write heads.

2

General throughput performance of the hard disk

Indicate problem with motor, servo or bearings.

3

Time needed by spindle to spin-up to full RPM

Indicate problem with motor or bearings.

4

Count of start/stop cycles of spindle

This value does not directly affect the condition of the drive.

5

Count of sectors moved to the spare area

Indicate problem with the disk surface or the read/write heads.

6

Margin of a channel while reading data

The exact function of this attribute is not specified.

7

Rate of positioning errors of the read/write heads

Indicate problem with servo, head. High temperature can also cause this problem.

8

Average time of seek operations of the heads

Indicate problem with servo.

9

Total time the drive is powered on

The unit of the measure depends on the manufacturer.

10

Retry count of spin start attempts

Indicate problem with motor, bearings or power supply.

11

Number of attempts to calibrate a drive

Indicate probl
em with motor, bearings or power supply.

12

Number of complete power on/off cycles

This value does not directly affect the condition of the drive.

13

Number of software read errors

The number of uncorreactable read errors.

190

Airflow temperature

The temperature of the air inside the hard disk housing.

191

Count of problems caused by mechanical shock

Acceleration (for example falling) can cause mechanical shock.

192

Count of power off cycles

This value does not directly affect the condition of the drive.

193

Count of load/unload cycles

Number of cycles the head moved into landing zone position.

194

Disk temperature

The temperature inside the hard disk housing.

195

Count of correctable errors

Number of errors corrected by the internal error correcting mechanism.

196

Count of sector remap operations

Number of all (successful and failed) remap operations.

197

Count of unstable sectors

These pending sectors may be remapped to the spare area.

198

Count of uncorrectable errors when reading/writing

Indicate problem with the disk surface or the read/write heads.

199

Count of errors during data transfer between disk and host

Indicate problem with the power supply or data cable.

200

Errors occured while writing raw data from a disk

Indicate problem with the disk surface or the read/write heads.

201

Number of software read errors

The number of uncorreactable read errors.

202

Number of data address mark errors

Number of incorrect or invalid address marks.

203

Number of data correction errors

Invalid error correction checksum found during error correction.

204

Number of corrected data errors

Errors corrected by the internal error correction mechanism.

205

Number of thermal problems

Total number of problems caused by high temperature.

206

Head flying height

The height of the disk heads above the disk surface.

207

Current value during spin up

The current needed to spin up the drive.

208

Number of cycles needed to spin up

The number of retries during spin up because of low current available.

209

Drive performance during offline operations

The seek performance of the drive during internal self tests.

220

Distance of the disk has shifted relative to the spindle

Incorrect disk spin can be cause by mechanical shock or high temperature.

221

Number of mechanical errors

Number of errors resulting from shock or vibration.

222

Number of powered on hours

This value is constantly increasing (once per every hour).

223

Number of load/unload operations

The number of drive head enters/leaves the data zone.

224

Mechanical friction rate

The rate of friction between mechanical parts. Indicate problem with the mechanical subsystem of the drive.

226

Total time the heads are loaded

The time while the read/write heads are in the data zone.

227

Rate of torque increase

Torque increase during the spin up operation of the hard disk.

228

Number of power off cycles

The number of times the head was retracted as a result of power loss.

230

Head positioning amplitude

Head moving distances between operations.

231

Disk temperature

The temperature inside the hard disk housing.

240

Number of head positioning hours

Time spent during the positioning of the drive heads.

250

Number 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).

01

Buffer over/under run counters

02_0000

Write errors corrected without substantial delay

02_0001

Write errors corrected with possible delays

02_0002

Total write errors

02_0003

Total write errors corrected

02_0004

Total write errors corrected by algorythm

02_0005

Total bytes written

02_0006

Total uncorrected write errors

03_0000

Read errors corrected by ECC hardware method

03_0001

Read errors corrected with possible delays

03_0002

Total read errors

03_0003

Total read errors corrected

03_0004

Total read errors corrected by algorythm

03_0005

Total bytes read

03_0006

Total uncorrected read errors

04_0000

Read reverse errors corrected by ECC hardware method

04_0001

Read reverse errors corrected with possible delays

04_0002

Total read reverse errors

04_0003

Total read reverse errors corrected

04_0004

Total read reverse errors corrected by algorythm

04_0005

Total bytes read reverse

04_0006

Total uncorrected read reverse errors

05_0000

Verify errors corrected without substantial delay

05_0001

Verify errors corrected with possible delays

05_0002

Total verify errors

05_0003

Total verify errors corrected

05_0004

Total verify errors corrected by algorythm

05_0005

Total bytes verified

05_0006

Total uncorrected verify errors

06_0000

Non medium errors

07

Last error event

0B

Last deferred error or asynchronous event

0D_0000

Temperature

0D_0001

Reference temperature

0E_0001

Manufacture date (year/week)

0E_0002

Accounting date

0E_0003

Specified cycle count over device lifetime

0E_0004

Accumulated start-stop cycles

0F

Application client parameter data

10

Self test results log

18

Protocol specific port log

37_0000

Blocks sent to initiator

37_0001

Blocks received from initiator

37_0002

Blocks read from cache and sent to initiator

37_0003

I/O commands with size smaller than segment size

37_0004

I/O commands with size larger than segment size

3E_0000

Power on time

3E_0008

Remaining minutes until next internal test

S.M.A.R.T. attributes