Hitachi HTS725050A9A364 Datasheet download pdf (Page 147)

7K500 OEM Specification

Page 147 of 176

.12 S.M.A.R.T. Disable Operations (Subcommand D9h)

S.M.A.R.T. Disable Operations (Subcommand D9h) S.M.A.R.T. Disable Operations (Subcommand D9h)

S.M.A.R.T. Disable Operations (Subcommand D9h)

This subcommand disables all S.M.A.R.T.capabilities within the device including the device’s

attribute autosave feature. After receipt of this subcommand the device disables all S.M.A.R.T.

operations. Non self-preserved Attribute Values will no longer be monitored. The state of

S.M.A.R.T. (either enabled or disabled) is preserved by the device across power cycles. Note that

this subcommand does not preclude the device’s power mode attribute autosaving.

Upon receipt of the S.M.A.R.T. Disable Operations subcommand from the host, the device disables

S.M.A.R.T. capabilities and functions.

After receipt of the device of the S.M.A.R.T. Disable Operations subcommand from the host, all other

S.M.A.R.T. subcommands—with the exception of S.M.A.R.T. Enable Operations—are disabled, and

invalid and will be aborted by the device (including the S.M.A.R.T. Disable Operations subcommand),

returning the error code as specified in “Table 124 S.M.A.R.T. Error Codes” on Page 158.

Any Attribute Values accumulated and saved to volatile memory prior to receipt of the S.M.A.R.T.

Disable Operations command will be preserved in the device’s Attribute Data Sectors. If the device is

re-enabled, these Attribute Values will be updated, as needed, upon receipt of a S.M.A.R.T. Read

Attribute Values or S.M.A.R.T. Save Attribute Values command.

.13 S.M.A.R.T. Return Status (Subcommand DAh)

S.M.A.R.T. Return Status (Subcommand DAh) S.M.A.R.T. Return Status (Subcommand DAh)

S.M.A.R.T. Return Status (Subcommand DAh)

This command is used to communicate the reliability status of the device to the host’s request. Upon

receipt of the S.M.A.R.T. Return Status subcommand the device asserts BSY, saves any updated

Attribute Values to the reserved sector and compares the updated Attribute Values to the Attribute

Thresholds.

If the device does not detect a Threshold Exceeded Condition, or detects a Threshold Exceeded

Condition but involving attributes are advisory, the device loads 4Fh into the LBA Mid register, C2h

into the LBA High register.

If the device detects a Threshold Exceeded Condition for prefailure attributes, the device loads F4h

into the LBA Mid register, 2Ch into the LBA High register. Advisory attributes never result in

negative reliability condition.

.14 S.M.A.R.T. Enable/Disable Automatic Off

S.M.A.R.T. Enable/Disable Automatic OffS.M.A.R.T. Enable/Disable Automatic Off

S.M.A.R.T. Enable/Disable Automatic Off-

-Line (Subcommand

Line (Subcommand Line (Subcommand

Line (Subcommand

DBh)

DBh) DBh)

DBh)

This subcommand enables and disables the optional feature that cause the device to perform the set

of off-line data collection activities that automatically collect attribute data in an off-line mode and

then save this data to the device’s non-volatile memory. This subcommand may either cause the

device to automatically initiate or resume performance of its off-line data collection activities or

cause the automatic off-line data collection feature to be disabled. This subcommand also enables

and disables the off-line read scanning feature that cause the device to perform the entire read

scanning with defect reallocation as the part of the off-line data collection activities.

The Sector Count register shall be set to specify the feature to be enabled or disabled.

Sector Count Feature Description

00h Disable Automatic Off-line

01h Disable Off-line Read Scanning

F8h Enable Automatic Off-line

F9h Enable Off-line Read Scanning

A value of zero written by the host into the device’s Sector Count register before issuing this

subcommand shall cause the automatic off-line data collection feature to be disabled. Disabling this

feature does not preclude the device from saving attribute values to non-volatile memory during

some other normal operation such as during a power-on or power-off sequence or during an error

recovery sequence.

A value of one written by the host into the device’s Sector Count register before issuing this

subcommand shall cause the off-line read scanning feature to be disabled. The Device does not

perform the off-line read scanning at the off-line data collection activities which is initiated by the

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Hitachi HTS725050A9A364 Datasheet Page 147

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