Linux磁盤檢測(cè)工具smartctl的使用和分析

1800xB4Unused Reserved Block Count TotalPre-Fail Attribute used at least in HP devices.

1830xB7SATA Downshift Error CountWestern Digital and Samsung attribute.

1840xb8End-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.

1850xB9Head StabilityWestern Digital attribute.

1860xBAInduced Op-Vibration DetectionWestern Digital attribute.

1870xBBReported Uncorrectable ErrorsThe count of errors that could not be recovered using hardware ECC .

1880xBCCommand TimeoutThe 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.

1890xBDHigh Fly WritesHDD 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 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.

1900xBEAirflow 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.)

1910xBFG-sense Error RateThe count of errors resulting from externally-induced shock vibration.

1920xC0Power-off Retract Countor Emergency Retract Cycle Count(Fujitsu)Count of times the heads are loaded off the media. Heads can be unloaded without actually powering off.

1930xC1Load Cycle Count orLoad/Unload Cycle Count(Fujitsu)Count of load/unload cycles into head landing zone position.

The typical lifetime rating for laptop (2.5-in) hard drives is 300,000 to 600,000 load cycles. Some laptop drives are programmed to unload the heads whenever there has not been any activity for about five seconds.Many Linux installations write to the file system a few times a minute in the background. 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

1940xC2Temperatureresp.Temperature CelsiusCurrent internal temperature.

1950xC3Hardware ECC Recovered(Vendor specific raw value.) The raw value has different structure for different vendors and is often not meaningful as a decimal number.

1960xC4Reallocation Event CountCount 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.

1970xC5Current Pending Sector CountCount 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.

1980xC6Uncorrectable Sector Countor

Offline Uncorrectableor

Off-Line Scan Uncorrectable Sector Count

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.

1990xC7UltraDMA CRC Error CountThe count of errors in data transfer via the interface cable as determined by ICRC (Interface Cyclic Redundancy Check).

2000xC8Multi-Zone Error RateThe count of errors found when writing a sector. The higher the value, the worse the disk's mechanical condition is.

2000xC8Write Error Rate (Fujitsu)The total count of errors when writing a sector.

2010xC9Soft Read Error Rate or

TA Counter Detected

Count of off-track errors.

2020xCAData Address Mark errorsor

TA Counter Increased

Count of Data Address Mark errors (or vendor-specific).

2030xCBRun Out CancelCount of ECC errors

2040xCCSoft ECC CorrectionCount of errors corrected by software ECC

2050xCDThermal Asperity Rate (TAR)Count of errors due to high temperature.

2060xCEFlying HeightHeight 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.