摘自 http://en.wikipedia.org/wiki/S.M.A.R.T

Legend
Higher raw value is better
数值越高越好
Lower raw value is better
数值值越低越好
Critical: red colored row
重要的特征表为红色
 		Potential indicators of imminent electromechanical failure
提示可能即将发生的器件错误
ID Hex Attribute name Better Description
01 0x01 Read Error Rate
读错误发生率

[13]

 (Vendor specific raw value.) Stores data related to the rate of hardware read errors that occurred when reading data from a disk surface. The raw value has different structure for different vendors and is often not meaningful as a decimal number.
（有的厂商为此处为raw value，比如希捷）保存了从硬盘表面上读取数据时，发生的硬件读取错误率。不同的厂商对此处的原始错误率有不同的解读，大多数情况下此数值不是10进制。
02 0x02 Throughput Performance
吞吐量表现
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.
硬盘总体上的吞吐量。如果这个值大幅度下降，硬盘很可能存在故障。
03 0x03 Spin-Up Time
主轴加速时间
Average time of spindle spin up (from zero RPM to fully operational [millisecs]).
硬盘主轴从每分钟0转到全速消耗的平均时间，以微妙为单位。
04 0x04 Start/Stop Count
启/停次数
 		  A tally of spindle start/stop cycles. The spindle turns on, and hence the count is increased, both when the hard disk is turned on after having before been turned entirely off (disconnected from power source) and when the hard disk returns from having previously been put to sleep mode.
硬盘主轴的启/停总次数。硬盘主轴启动一次，这个值就加一，包括断电后重启、硬盘从睡眠模式下恢复。
05 0x05 Reallocated Sectors Count
重分配扇区数
Count of reallocated sectors. When the hard drive finds a read/write/verification error, it marks that 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". The raw value normally represents a count of the bad sectors that have been found and remapped. Thus, the higher the attribute value, the more sectors the drive has had to reallocate. This allows a drive with bad sectors to continue operation; however, a drive which has had any reallocations at all is significantly more likely to fail in the near future.[2] While primarily used as a metric of the life expectancy of the drive, this number also affects performance. As the count of reallocated sectors increases, the read/write speed tends to become worse because thedrive head is forced to seek to the reserved area whenever a remap is accessed. A workaround which will preserve drive speed at the expense of capacity is to create adisk partition over the region which contains remaps and instruct the operating system to not use that partition.
重分配扇区数。当硬盘发现一次读/写/验证错误后，会将这个扇区标志为“reallocated”，然后将数据转移到硬盘的保留空间。这个过程也被称为重映射（remapped），重新分配的扇区被称为“remaps”。这个值通常代表了被发现并被重分配的坏扇区的数量。所以，这个值越大，说明被重分配的扇区越多。这允许硬盘即使存在坏扇区也能继续工作，然而，硬盘上越多的重分配块，就越容易造成访问失败。
06 0x06 Read Channel Margin   Margin of a channel while reading data. The function of this attribute is not specified.
07 0x07 Seek Error Rate
寻道错误率
 		N/A (Vendor specific raw value.) Rate of seek errors of the magnetic heads. If there is a partial failure in the mechanical positioning system, then seek errors will arise. Such a failure may be due to numerous factors, such as damage to a servo, or thermal widening of the hard disk. The raw value has different structure for different vendors and is often not meaningful as a decimal number.
硬盘磁头寻道错误率。如果机械定位部分出现，寻道错误率会升高。
08 0x08 Seek Time Performance
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 0x09 Power-On Hours (POH)
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.[15]
10 0x0A Spin Retry Count
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 0x0B Recalibration Retries or Calibration Retry Count
This attribute indicates the count that recalibration was requested (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.
12 0x0C Power Cycle Count   This attribute indicates the count of full hard disk power on/off cycles.
13 0x0D Soft Read Error Rate
Uncorrected read errors reported to the operating system.
180 0xB4 Unused Reserved Block Count Total   "Pre-Fail" Attribute used at least in HP devices.
183 0xB7 SATA Downshift Error Count   Western Digital and Samsung attribute.
184 0xB8 End-to-End error / IOEDC
This attribute is a part of Hewlett-Packard's SMART IV technology, as well as part of other vendors' IO Error Detection and Correction schemas, and it contains a count of parity errors which occur in the data path to the media via the drive's cache RAM.[16]
185 0xB9 Head Stability   Western Digital attribute.
186 0xBA Induced Op-Vibration Detection   Western Digital attribute.
187 0xBB Reported Uncorrectable Errors
The count of errors that could not be recovered using hardware ECC (see attribute 195).
188 0xBC Command Timeout
The count of aborted operations due to HDD timeout. Normally this attribute value should be equal to zero and if the value is far above zero, then most likely there will be some serious problems with power supply or an oxidized data cable.[17]
189 0xBD High Fly Writes
HDD producers implement a Fly Height Monitor that attempts to provide additional protections for write operations by detecting when a recording head is flying outside its normal operating range. If an unsafe fly height condition is encountered, the write process is stopped, and the information is rewritten or reallocated to a safe region of the hard drive. This attribute indicates the count of these errors detected over the lifetime of the drive.

This feature is implemented in most modern Seagate drives[1] and some of Western Digital’s drives, beginning with the WD Enterprise WDE18300 and WDE9180 Ultra2 SCSI hard drives, and will be included on all future WD Enterprise products.[18]
190 0xBE Airflow Temperature (WDC) resp. Airflow Temperature Celsius (HP)
Airflow temperature on Western Digital HDs (Same as temp. [C2], but current value is 50 less for some models. Marked as obsolete.)
190 0xBE Temperature Difference from 100
Value is equal to (100−temp. °C), allowing manufacturer to set a minimum threshold which corresponds to a maximum temperature.
191 0xBF G-sense Error Rate
The count of errors resulting from externally-induced shock & vibration.
192 0xC0 Power-off Retract Count or Emergency Retract Cycle Count (Fujitsu)[19]
Count of times the heads are loaded off the media. Heads can be unloaded without actually powering off.[citation needed]
193 0xC1 Load Cycle Count or Load/Unload Cycle Count (Fujitsu)
Count of load/unload cycles into head landing zone position.[19]

The typical lifetime rating for laptop (2.5-in) hard drives is 300,000 to 600,000 load cycles.[20] Some laptop drives are programmed to unload the heads whenever there has not been any activity for about five seconds.[21] Many Linux installations write to the file system a few times a minute in the background.[22] As a result, there may be 100 or more load cycles per hour, and the load cycle rating may be exceeded in less than a year.[23]
194 0xC2 Temperature resp. Temperature Celsius
Current internal temperature.
195 0xC3 Hardware ECC Recovered N/A (Vendor specific raw value.) The raw value has different structure for different vendors and is often not meaningful as a decimal number.
196 0xC4 Reallocation Event Count
Count of remap operations. The raw value of this attribute shows the total count of attempts to transfer data from reallocated sectors to a spare area. Both successful & unsuccessful attempts are counted.[24]
197 0xC5 Current Pending Sector Count
Count of "unstable" sectors (waiting to be remapped, because of read errors). If an unstable sector is subsequently read successfully, this value is decreased and the sector is not remapped. Read errors on a sector will not remap the sector (since it might be readable later); instead, the drive firmware remembers that the sector needs to be remapped, and remaps it the next time it's written.[25]
198 0xC6 Uncorrectable Sector Count or

Offline Uncorrectable or

Off-Line Scan Uncorrectable Sector Count[19]
The total count 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 0xC7 UltraDMA CRC Error Count
The count of errors in data transfer via the interface cable as determined by ICRC (Interface Cyclic Redundancy Check).
200 0xC8 Multi-Zone Error Rate [26]
The count of errors found when writing a sector. The higher the value, the worse the disk's mechanical condition is.
200 0xC8 Write Error Rate (Fujitsu)
The total count of errors when writing a sector.[27]
201 0xC9 Soft Read Error Rate or

TA Counter Detected
Count of off-track errors.
202 0xCA Data Address Mark errors or

TA Counter Increased
Count of Data Address Mark errors (or vendor-specific).[citation needed]
203 0xCB Run Out Cancel
Count of ECC errors
204 0xCC Soft ECC Correction
Count of errors corrected by software ECC[citation needed]
205 0xCD Thermal Asperity Rate (TAR)
Count of errors due to high temperature.[17]
206 0xCE Flying Height   Height of heads above the disk surface. A flying height that's too low increases the chances of a head crash while a flying height that's too high increases the chances of a read/write error.[citation needed]
207 0xCF Spin High Current
Amount of surge current used to spin up the drive.[17]
208 0xD0 Spin Buzz   Count of buzz routines needed to spin up the drive due to insufficient power.[17]
209 0xD1 Offline Seek Performance   Drive’s seek performance during its internal tests.[17]
210 0xD2  ?   (found in a Maxtor 6B200M0 200GB and Maxtor 2R015H1 15GB disks)
211 0xD3 Vibration During Write   Vibration During Write[citation needed]
212 0xD4 Shock During Write   Shock During Write[citation needed]
220 0xDC Disk Shift
Distance the disk has shifted relative to the spindle (usually due to shock or temperature). Unit of measure is unknown.
221 0xDD G-Sense Error Rate
The count of errors resulting from externally-induced shock & vibration.
222 0xDE Loaded Hours   Time spent operating under data load (movement of magnetic head armature)[citation needed]
223 0xDF Load/Unload Retry Count   Count of times head changes position.[citation needed]
224 0xE0 Load Friction
Resistance caused by friction in mechanical parts while operating.[citation needed]
225 0xE1 Load/Unload Cycle Count
Total count of load cycles[citation needed]
226 0xE2 Load 'In'-time   Total time of loading on the magnetic heads actuator (time not spent in parking area).[citation needed]
227 0xE3 Torque Amplification Count
Count of attempts to compensate for platter speed variations[citation needed]
228 0xE4 Power-Off Retract Cycle
The count of times the magnetic armature was retracted automatically as a result of cutting power.[citation needed]
230 0xE6 GMR Head Amplitude   Amplitude of "thrashing" (distance of repetitive forward/reverse head motion)[citation needed]
231 0xE7 Temperature
Drive Temperature
232 0xE8 Endurance Remaining   Number of physical erase cycles completed on the drive as a percentage of the maximum physical erase cycles the drive is designed to endure
232 0xE8 Available Reserved Space   Intel SSD reports the number of available reserved space as a percentage of reserved space in a brand new SSD.
233 0xE9 Power-On Hours   Number of hours elapsed in the power-on state.
233 0xE9 Media Wearout Indicator   Intel SSD reports a normalized value of 100 (when the SSD is new) and declines to a minimum value of 1. It decreases while the NAND erase cycles increase from 0 to the maximum-rated cycles.
240 0xF0 Head Flying Hours   Time while head is positioning[citation needed]
240 0xF0 Transfer Error Rate (Fujitsu)   Count of times the link is reset during a data transfer.[28]
241 0xF1 Total LBAs Written   Total count of LBAs written
242 0xF2 Total LBAs Read   Total count of LBAs read.
Some S.M.A.R.T. utilities will report a negative number for the raw value since in reality it has 48 bits rather than 32.
250 0xFA Read Error Retry Rate
Count of errors while reading from a disk
254 0xFE Free Fall Protection
Count of "Free Fall Events" detected [29]

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