5.3 Host Commands

Table 5.9 Features Field values (subcommands) and functions (1/3)

Features Field

 

Function

 

 

 

 

X 'D0'

SMART READ DATA:

 

A device that received this subcommand saves all the updated attribute

 

values. The device then transfers 512-byte attribute value information to the

 

host after transferring PIOSU.

 

* For information about the format of the attribute value information, see

 

Table 5.10.

 

 

 

 

X 'D1'

SMART READ ATTRIBUTE THRESHOLDS:

 

This subcommand is used to transfer 512-byte guarantee failure threshold

 

value data to the host.

 

* For information about the format of the guarantee failure threshold value

 

data, see Table 5.11.

 

 

 

 

X 'D2'

SMART ENABLE/DISABLE ATTRIBUTE AUTOSAVE:

 

Enables (by setting the Sector Count field to a value other than 00h) or disables

 

(by setting the Sector Count field to 00h) a function that automatically saves

 

device attribute values ("automatic attribute save function"). This setting is

 

held regardless of whether the device is turned on or off. If the automatic

 

attribute save function is enabled and more than 15 minutes has elapsed since

 

the last time that attributes were saved, then the attributes are saved.

 

However, if the automatic attribute save function is disabled, the attributes

 

are not saved. Upon receiving this subcommand, a device enables or

 

disables the automatic attribute save function, and transfers the RegDH, then

 

reports the status.

 

In this drive, this function is enabled at the shipment from the factory.

 

 

 

 

X 'D3'

SMART SAVE ATTRIBUTE VALUES:

 

When the device receives this subcommand, if saves device attribute value

 

data, and transfers the RegDH, then reports the status.

 

 

X 'D4'

SMART EXECUTIVE OFF-LINE IMMEDIATE:

 

A device which receives this command starts collecting the off-line data

 

specified in the Sector Number field, or stops.

 

In the off-line mode, after transferring the RegDH, off-line data are

 

collected. In the captive mode, it collects off-line data then transfers the

 

RegDH when collection of data is completed.

 

 

SN Off-line data collection mode

 

 

00h: Off-line diagnosis (off-line mode)

 

01h: Simple self-test (off-line mode)

 

02h: Comprehensive self-test (off-line mode)

 

 

03h: Conveyance self-test (off-line mode)

 

04h: Selective self-test (off-line mode)

 

7Fh: Self-test stop

 

81h: Simple self-test (captive mode)

 

82h: Comprehensive self-test (captive mode)

 

 

83h: Conveyance self-test (captive mode)

 

 

84h: Selective self-test (captive mode)

 

 

 

 

C141-E280

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