Seagate ST1500VM002, ST2000VM002 manual Conducted noise, Voltage tolerance, Power-management modes

www.seagate.com Drive Specifications

2.8.2 Conducted noise

Input noise ripple is measured at the host system power supply across an equivalent 80-ohm resistive load on the +12V line or an equivalent 15-ohm resistive load on the +5V line.

•Using 12V power, the drive is expected to operate with a maximum of 120 mV peak-to-peak square-wave injected noise at up to 10MHz.

•Using 5V power, the drive is expected to operate with a maximum of 100 mV peak-to-peak square-wave injected noise at up to 10MHz.

Note. Equivalent resistance is calculated by dividing the nominal voltage by the typical RMS read/write current.

2.8.3 Voltage tolerance

Voltage tolerance (including noise):

5V: ± 5%

12V: ± 10%

2.8.4 Power-management modes

The drive provides programmable power management to provide greater energy efficiency. In most systems, you can control power management through the system setup program. The drive features the following power- management modes:

	Power modes	Heads	Spindle	Buffer
	Active	Tracking	Rotating	Enabled
	Idle	Tracking	Rotating	Enabled
	Standby	Parked	Stopped	Enabled
	Sleep	Parked	Stopped	Disabled
• Active mode
	The drive is in Active mode during the read/write and seek operations.
•	Idle mode
	The buffer remains enabled, and the drive accepts all commands and returns to Active mode any time disk
	access is necessary.
• Standby mode
	The drive enters Standby mode when the host sends a Standby Immediate command. If the host has set the
	standby timer, the drive can also enter Standby mode automatically after the drive has been inactive for a spec-
	ifiable length of time. The standby timer delay is established using a Standby or Idle command. In Standby
	mode, the drive buffer is enabled, the heads are parked and the spindle is at rest. The drive accepts all com-
	mands and returns to Active mode any time disk access is necessary.
• Sleep mode
	The drive enters Sleep mode after receiving a Sleep command from the host. In Sleep mode, the drive buffer is
	disabled, the heads are parked and the spindle is at rest. The drive leaves Sleep mode after it receives a Hard
	Reset or Soft Reset from the host. After receiving a reset, the drive exits Sleep mode and enters Standby mode
	with all current translation parameters intact.
•	Idle and Standby timers
	Each time the drive performs an Active function (read, write or seek), the standby timer is reinitialized and
	begins counting down from its specified delay times to zero. If the standby timer reaches zero before any drive
	activity is required, the drive makes a transition to Standby mode. In both Idle and Standby mode, the drive
	accepts all commands and returns to Active mode when disk access is necessary.

Pipeline HD SATA Product Manual, Rev. B 17