Hitachi 100GB 7200 RPM HTE721010G9SA00 Manual Do Utilizador
Códigos do produto
HTE721010G9SA00
Travelstar E7K100 (Serial ATA) Hard Disk Drive Specification
53
10.8.2 Attribute values
Attribute values are used to represent the relative reliability of individual performance or calibration attributes.
Higher attribute values indicate that the analysis algorithms being used by the device are predicting a lower proba-
bility of a degrading or fault condition existing. Accordingly, lower attribute values indicate that the analysis algo-
rithms being used by the device are predicting a higher probability of a degrading or fault condition existing. There
is no implied linear reliability relationship corresponding to the numerical relationship between different attribute
values for any particular attribute.
Higher attribute values indicate that the analysis algorithms being used by the device are predicting a lower proba-
bility of a degrading or fault condition existing. Accordingly, lower attribute values indicate that the analysis algo-
rithms being used by the device are predicting a higher probability of a degrading or fault condition existing. There
is no implied linear reliability relationship corresponding to the numerical relationship between different attribute
values for any particular attribute.
10.8.3 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 value 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.
value to indicate the existence of a degrading or faulty condition. The numerical value 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.
10.8.4 Threshold exceeded condition
If one or more attribute values are less than or equal to their corresponding attribute thresholds, then the device
reliability status is negative, indicating an impending degrading or faulty condition.
reliability status is negative, indicating an impending degrading or faulty condition.
10.8.5 S.M.A.R.T. commands
The S.M.A.R.T. commands provide access to attribute values, attribute thresholds and other logging and reporting
information.
information.
10.8.6 S.M.A.R.T. operation with power management modes
The device saves attribute values automatically on every head unload timing except the emergency unload, even if
the attribute auto save feature is not enabled. The head unload is done not only by Standby, Standby Immediate,
Sleep command, and Hard Reset, but also by the Standby timer. So it is not necessary for a host system to enable
the attribute auto save feature when it utilizes the power management. If the attribute auto save feature is enabled,
attribute values will be saved after 30 minutes have passed since the last saving, besides above condition.
the attribute auto save feature is not enabled. The head unload is done not only by Standby, Standby Immediate,
Sleep command, and Hard Reset, but also by the Standby timer. So it is not necessary for a host system to enable
the attribute auto save feature when it utilizes the power management. If the attribute auto save feature is enabled,
attribute values will be saved after 30 minutes have passed since the last saving, besides above condition.
10.9 Security Mode Feature Set
Security Mode Feature Set is a powerful security feature. With a device lock password, a user can prevent
unauthorized access to a device even if it is removed from the computer.
unauthorized access to a device even if it is removed from the computer.
New commands are supported for this feature as listed below:
Security Set Password
('F1'h)
Security Unlock
('F2'h)
Security Erase Prepare
('F3'h)
Security Erase Unit
('F4'h)
Security Freeze Lock
('F5'h)
Security Disable Password
('F6'h)