Seagate ST1200MM0017 ユーザーズマニュアル

S

EAGATE 

E

NTERPRISE 

P

ERFORMANCE 

10K HDD 

V

7  P

RODUCT 

M

ANUAL

, R

EV

. C

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This section provides information relating to the physical and electrical characteristics of the drive.

TM

Drives using the load/unload architecture provide programmable power management to tailor systems for performance and 
greater energy efficiency.

The table below lists the supported PowerChoice modes. The further down in the table, the more power savings can be 
realized. For example, Idle_B mode results in greater power savings than Idle_A mode. Standby modes results in the 
greatest power savings. 

Idle_A

Reduced electronics

Idle_B

Heads unloaded. Disks spinning at full RPM

Idle_C

Heads unloaded. Disks spinning at reduced RPM

Standby_Y

Heads unloaded. Disks spinning at reduced RPM

Standby_Z

Heads unloaded. Motor stopped (disks not spinning)

PowerChoice

TM 

can be invoked using one of these two methods:

• Power Condition mode page method—Enable and initialize the idle condition timers and/or the standby condition timers. 

The timer values are based on the values set in the Power Condition mode page. 

• START STOP UNIT command method—Use the START STOP UNIT command (OPERATION CODE 1Bh). This allows 

the host to directly transition the drive to any supported PowerChoice mode. 

If both the Power Condition mode page and START STOP UNIT command methods are used, the START STOP UNIT 
command request takes precedence over the Power Condition mode page power control and may disable the idle condition 
and standby condition timers. The REQUEST SENSE command reports the current PowerChoice state if active and also the 
method by which the drive entered the PowerChoice state.

When the drive receives a command, all power condition timers are suspended if they were enabled via the Power Condition 
mode page. Once all outstanding commands are processed, the power condition timers are reinitialized to the values defined 
in the Power Condition mode page.