Hysical Electrical Specifications; Ower Hoice Tm Power Management - Seagate ST9900805SS Product Manual

6.0 P /
HYSICAL ELECTRICAL SPECIFICATIONS
This section provides information relating to the physical and electrical characteristics of the drive.
6.1 P C
OWER HOICE
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 you go down in the table, the more power savings you
get. For example, Idle_B mode results in greater power savings than Idle_A mode. Standby modes results in the greatest
power savings.
PowerChoice modes
M
ODE
Idle_A
Idle_B
Idle_C
Standby_Y
Standby_Z
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.
S 10K.5 SAS P
AVVIO RODUCT
TM
POWER MANAGEMENT
D
ESCRIPTION
Reduced electronics
Heads unloaded. Disks spinning at full RPM
Heads unloaded. Disks spinning at reduced RPM
Heads unloaded. Disks spinning at reduced RPM
Heads unloaded. Motor stopped (disks not spinning)
M , R . J
ANUAL EV
19