Physical/Electrical Specifications; Powerchoice™ Power Management - Seagate EXOS ST16000NM002G Product Manual

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6.0

Physical/electrical specifications

This section provides information relating to the physical and electrical characteristics of the drive.
6.1 PowerChoice™ power management
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 the user goes in the table, the more power savings the user gets. For
example, Idle_B mode results in greater power savings than Idle_A mode. Standby_Z mode results in the greatest power savings.
PowerChoice modes
Mode Description
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.
Recovery requires the NOTIFY (Enable Spinup) command.
Standby_Z Heads unloaded. Motor stopped (disks not spinning)
Recovery requires the NOTIFY (Enable Spinup) command.
PowerChoice 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
Seagate Exos X16 SAS Product Manual, Rev. D
Physical/electrical specifications
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