Attribute Thresholds; Threshold Exceeded Condition; Commands; Operation With Power Management Modes - IBM IC25N020ATDA04 - Travelstar 20 GB Hard Drive Specifications

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.

11.7.3 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.

11.7.4 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.
11.7.5 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.
11.7.6 S.M.A.R.T. operation with power management modes
It is recommended that, when a host system utilizes both the power management and S.M.A.R.T.
features, the system enables the device's attribute auto save feature to allow the device's automatic
attribute saving upon receipt of STANDBY IMMEDIATE or SLEEP commands. If the device has been set
to utilize the standby timer, the device also saves attribute values prior to going from an Idle state to
Standby state.

11.8 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.
New commands are supported for this feature as below.
Security Set Password
Security Unlock
Security Erase Prepare
Security Erase Unit
Security Freeze Lock
Security Disable Password
('F1'h)
('F2'h)
('F3'h)
('F4'h)
('F5'h)
('F6'h)
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
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