7K6000 datasheet(57/274 Pages) WESTERN

57 / 274 page

HGST Hard Disk Drive Specification

9.5

SMART Function

The intent of Self-monitoring, analysis and reporting technology (SMART) is to protect user data and prevent

unscheduled system downtime that may be caused by predictable degradation and/or fault of the device. By

monitoring and storing critical performance and calibration parameters, SMART devices employ sophisticated data

analysis algorithms to predict the likelihood of near-term degradation or fault condition. By alerting the host system of

a negative reliability status condition, the host system can warn the user of the impending risk of a data loss and

advise the user of appropriate action.

9.5.1

Attributes

Attributes are the specific performance or calibration parameters that are used in analyzing the status of the device.

Attributes are selected by the device manufacturer b

ased on that attribute’s ability to contribute to the prediction of

degrading or faulty conditions for that particular device. The specific set of attributes being used and the identity of

these attributes is vendor specific and proprietary.

9.5.2

Attribute values

Attribute values are used to represent the relative reliability of individual performance or calibration attributes. The

valid range of attribute values is from 1 to 253 decimal. Higher attribute values indicate that the analysis algorithms

being used by the device are predicting a lower probability of a degrading or faulty condition existing. Accordingly,

lower attribute values indicate that the analysis algorithms being used by the device are predicting a higher probability

of a degrading or faulty condition existing.

9.5.3

Attribute thresholds

Each attribute value has a corresponding attribute threshold limit which is used for direct comparison to the attribute

value to indicate the existence of a degrading or faulty condition. The numerical values of the attribute thresholds are

determined by the device manufacturer through design and reliability testing and analysis. Each attribute threshold

represents the lowest limit to which its corresponding attribute value can be equal while still retaining a positive

reliability status. Attribute thresholds are set at the device manufacturer’s factory and cannot be changed in the field.

The valid range for attribute thresholds is from 1 through 253 decimal.

9.5.4

Threshold exceeded condition

If one or more attribute values, whose Pre-failure bit of their status flag is set, are less than or equal to their

corresponding attribute thresholds, then the device reliability status is negative, indicating an impending degrading or

faulty condition.

9.5.5

SMART commands

The SMART commands provide access to attribute values, attribute thresholds and other logging and reporting

information.

9.5.6

Off-line Read Scanning

The device provides the off-line read scanning feature with reallocation. This is the extension of the off-line data

collection capability. The device performs the entire read scan with reallocation for the marginal sectors to prevent

the user data lost.

If interrupted by the host during the read scanning, the device services the host command.

9.5.7

Error Log

Logging of reported errors is supported. The device provides information on the last five errors that the device reported

as described in SMART error log sector. The device may also provide additional vendor specific information on these

reported errors. The error log is not disabled when SMART is disabled. Disabling SMART shall disable the delivering

of error log information via the SMART READ LOG SECTOR command.

If a device receives a firmware modification, all error log data is discarded and the device error count for the life of

the device is reset to zero.

7K6000 Datasheet(PDF) 57 Page - Western Digital Corporation or its affiliates.

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