Hitachi HTS725050A9A364 Datasheet download pdf (Page 58)

7K500 OEM Specification

Page 58 of 176

12.8.3

12.8.312.8.3

12.8.3

Attribute thresholds

Attribute thresholds Attribute thresholds

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.

12.8.4

12.8.412.8.4

12.8.4

Threshold exceeded condition

Threshold exceeded condition Threshold exceeded condition

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.

12.8.5

12.8.512.8.5

12.8.5

S.M.A.R.T. commands

S.M.A.R.T. commands S.M.A.R.T. commands

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.

12.8.6

12.8.612.8.6

12.8.6

S.M.

S.M.S.M.

S.M.A.

A.A.

A.R.T operation with power management modes

R.T operation with power management modes R.T operation with power management modes

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, or Sleep command, but also by the automatic power saving functions

like ABLE-3 or Standby timer. So basically 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 30minutes passed since the last saving,

besides above condition.

12.9

12.912.9

12.9 Security Mode Feature Set

Security Mode Feature Set Security Mode Feature Set

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 hard disk device even if the device is removed from the computer.

New commands are supported for this feature as 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)

12.9.1

12.9.112.9.1

12.9.1

Security mode

Security mode Security mode

Security mode

Following security modes are provided.

Device Locked mode

The device disables media access commands after power on. Media access

commands are enabled by either a security unlock command or a security

erase unit command.

Device Unlocked mode

The device enables all commands. If a password is not set this mode is

entered after power on, otherwise it is entered by a security unlock or a

security erase unit command.

Device Frozen mode

The device enables all commands except those which can update the device

lock function, set/change password. The device enters this mode via a

Security Freeze Lock command. It cannot quit this mode until power off.

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Hitachi HTS725050A9A364 Datasheet Page 58

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