Smart Function; Table 49 Power Conditions; Interface Capability For Power Modes; Attribute Values - Hitachi CinemaStar P7K500 Specifications

8.4.4

Interface Capability for Power Modes

Each power mode affects the physical interface as defined in the following table:
Mode
Active
Idle
Standby
sleep

Table 49 Power conditions

Ready (RDY) is not a power condition. A device may post ready at the interface even though the media may
not be accessible.

8.5 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.
8.5.1 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 based 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.
8.5.2

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.
8.5.3

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.
HITACHI Deskstar & CinemaStar P7K500 Hard Disk Drive specification (Rev 1.1)
BSY RDY
x x
0 1
0 1
x x
68
Interface active Media
Yes Active
Yes Active
Yes Inactive
No Inactive