Active@ Hard Disk Monitor. S.M.A.R.T. Attributes

Each drive manufacturer defines a set of attributes and selects threshold values which attributes should not go below under normal operation.

Attribute values can range from 1 to 253 (1 representing the worst case and 253 representing the best). Depending on the manufacturer, a value of 100 or 200 will often be chosen as the "normal" value. Manufacturers that have supported one or more S.M.A.R.T. attributes in various products include: Samsung, Seagate, IBM ( Hitachi), Fujitsu, Maxtor, Western Digital.

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.

Note that the attribute values are always mapped to the range of 1 to 253 in a way that means higher values are better. For example, the "Reallocated Sectors Count" attribute value decreases as the number of reallocated sectors increases. 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.

Known S.M.A.R.T. attributes

Active@ Disk Monitor 3.1

Active@ Disk Monitor 3.1
14-days Trial

12.2 MB

download

Active@ Disk Monitor 3.1

disk monitor buy

 

Screenshots

Support

Legend

disk monitor

Higher value is better

disk monitor smart attributes

Lower value is better

Critical

 

Potential indicators of imminent electromechanical failure

ID

Hex

Attribute name

Better

Description

01

01

Read Error Rate

disk monitor smart attributes

Indicates the rate of hardware read errors that occurred when reading data from a disk surface. Any number indicates a problem with either disk surface or read/write heads.

02

02

Throughput Performance

disk monitor smart attributes

Overall (general) throughput performance of a hard disk drive. If the value of this attribute is decreasing there is a high probability that there is a problem with the disk.

03

03

Spin-Up Time

disk monitor smart attributes

Average time of spindle spin up (from zero RPM to fully operational).

04

04

Start/Stop Count

 

A tally of spindle start/stop cycles.

05

05

Reallocated Sectors Count

disk monitor smart attributes

Count of reallocated sectors. 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). This process is also known as remapping and "reallocated" sectors are called remaps. This is why, on modern hard disks, "bad blocks" cannot be found while testing the surface — all bad blocks are hidden in reallocated sectors. However, the more sectors that are reallocated, the more read/write speed will decrease.

06

06

Read Channel Margin

 

Margin of a channel while reading data. The function of this attribute is not specified.

07

07

Seek Error Rate

disk monitor smart attributes

Rate of seek errors 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. More seek errors indicates a worsening condition of a disk surface and the mechanical subsystem.

08

08

Seek Time Performance

disk monitor smart attributes

Average performance of seek operations of the magnetic heads. If this attribute is decreasing, it is a sign of problems in the mechanical subsystem.

09

09

Power-On Hours (POH)

disk monitor Power-On Hours

Count of hours in power-on state. The raw value of this attribute shows total count of hours (or minutes, or seconds, depending on manufacturer) in power-on state.

10

0A

Spin Retry Count

disk monitor

Count of retry of spin start attempts. 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). An increase of this attribute value is a sign of problems in the hard disk mechanical subsystem.

11

0B

Recalibration Retries

Recalibration Retries

This attribute indicates the number of times recalibration was requested (under the condition that the first attempt was unsuccessful). A decrease of this attribute value is a sign of problems in the hard disk mechanical subsystem.

12

0C

Device Power Cycle Count

 

This attribute indicates the count of full hard disk power on/off cycles.

13

0D

Soft Read Error Rate

disk monitor

Uncorrected read errors reported to the operating system. If the value is non-zero, you should back up your data.

190

BE

Airflow Temperature (WDC)

hard disk monitor

Airflow temperature on Western Digital HDs (Same as temp. (C2), but current value is 50 less.)

190

BE

Temperature Difference from 100

disk monitor, smart attributes

Value is equal to (100 -temp °C), allowing manufacturer to set a minimum threshold which corresponds to a maximum temperature.

Seagate ST910021AS: Verified Present
Seagate ST3802110A: Verified Present 2007-02-13
Seagate ST980825AS: Verified Present 2007-04-05
Seagate ST3320620AS: Verified Present 2007-04-23
Seagate ST3500641AS: Verified Present 2007-06-12
Seagate ST3250824AS: Verified Present 2007-08-07

191

BF

G-sense error rate

disk monitor

Frequency of mistakes as a result of impact loads

192

CO

Power-off Retract Count

 

Number of times the heads are loaded off the media. Heads can be unloaded without actually powering off. (or Emergency Retract Cycle count -Fujitsu)

193

C1

Load/Unload Cycle

 

Count of load/unload cycles into head landing zone position.

194

C2

Temperature

disk monitor temperature

Current internal temperature.

195

C3

Hardware ECC Recovered

Hardware ECC Recovered

Time between ECC-corrected errors.

196

C4

Reallocation Event Count

disk monitor

Count of remap operations. The raw value of this attribute shows the total number of attempts to transfer data from reallocated sectors to a spare area. Both successful & unsuccessful attempts are counted.

197

C5

Current Pending Sector Count

Current Pending Sector Count

Number of "unstable" sectors (waiting to be remapped). If the unstable sector is subsequently written or read successfully, this value is decreased and the sector is not remapped. Read errors on the sector will not remap the sector, it will only be remapped on a failed write attempt. This can be problematic to test because cached writes will not remap the sector, only direct I/O writes to the disk.

198

C6

Uncorrectable Sector Count

Uncorrectable Sector Count

The total number of uncorrectable errors when reading/writing a sector. A rise in the value of this attribute indicates defects of the disk surface and/or problems in the mechanical subsystem.

199

C7

UltraDMA CRC Error Count

UltraDMA CRC Error Count

The number of errors in data transfer via the interface cable as determined by ICRC (Interface Cyclic Redundancy Check).

200

C8

Write Error Rate / Multi-Zone Error Rate

Disk Monitor. Write Error Rate

The total number of errors when writing a sector.

201

C9

Soft Read Error Rate

Soft Read Error Rate

Number of off-track errors. If non-zero, make a backup.

202

CA

Data Address Mark errors

Data Address Mark errors

Number of Data Address Mark errors (or vendorspecific).

203

CB

Run Out Cancel

Hard disk monitor. Run Out Cancel

Number of ECC errors

204

CC

Soft ECC Correction

Soft ECC Correction

Number of errors corrected by software ECC

205

CD

Thermal Asperity Rate (TAR)

Thermal Asperity Rate

Number of thermal asperity errors.

206

CE

Flying Height

 

 

207

CF

Spin High Current

 

Amount of high current used to spin up the drive.

208

D0

Spin Buzz

 

Number of buzz routines to spin up the drive

209

D1

Offline Seek Performance

 

Drive's seek performance during offline operations

220

DC

Disk Shift

Distance the disk has shifted relative to the spindle

Distance the disk has shifted relative to the spindle (usually due to shock). Unit of measure is unknown.

221

DD

G-Sense Error Rate

G-Sense Error Rate

The number of errors resulting from externally-induced shock & vibration.

222

DE

Loaded Hours

 

Time spent operating under data load (movement of magnetic head armature)

223

DF

Load/Unload Retry Count

 

Number of times head changes position.

224

E0

Load Friction

Load Friction

Resistance caused by friction in mechanical parts while operating.

225

E1

Load/Unload Cycle Count

Hard disk monitor

Total number of load cycles

226

E2

Load 'In'-time

 

Total time of loading on the magnetic heads actuator (time not spent in parking area).

227

E3

Torque Amplification Count

Torque Amplification Count

Number of attempts to compensate for platter speed variations

228

E4

Power- Off Retract Cycle

Hard disk monitor

The number of times the magnetic armature was retracted automatically as a result of cutting power.

230

E6

GMR Head Amplitude

 

Amplitude of "thrashing" (distance of repetitive forward/reverse head motion)

231

E7

Temperature

hard disk temperature

Drive Temperature

240

F0

Head Flying Hours

Hard disk monitor.Head Flying Hours

Time while head is positioning

250

FA

Read Error Retry Rate

Read Error Retry Rate

Number of errors while reading from a disk