Conducted Noise; Supply Voltage; Power Management Modes - Seagate Skyhawk ST2000LV000 Product Manual

2.7.2

Conducted noise

Input noise ripple is measured at the host system power supply across an equivalent 15-ohm resistive load on the +5 volt line.
• Using 5-volt power, the drive is expected to operate with a maximum of 100 mV peak-to-peak square-wave injected noise at up to 20 MHz.
Equivalent resistance is calculated by dividing the nominal voltage by the typical RMS read/write current.
Note
2.7.3

Supply Voltage

Allowable voltage
Allowable noise/ripple
Allowable supply rise time
2.7.4

Power management modes

The drive provides programmable power management to provide greater energy efficiency. In most systems, power management is controlled
through the system setup program. The drive features the following power-management modes:
Table 5 Power modes
Power modes
Active (operating)
Idle, performance
Idle, active
Idle, low power
Standby
Sleep
• Active mode
The drive is in Active mode during the read/write and seek operations.
Idle mode
n
The electronics remains powered, and the drive accepts all commands and returns to Active mode when disk access is necessary.
• Standby mode
The drive enters Standby mode immediately 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 specifiable length of time. The standby timer delay is established
using a Standby or Idle command. In Standby mode, the electronics are in low power mode, the heads are parked and the spindle is at rest. The
drive accepts all commands and returns to Active mode when disk access is necessary.
Sleep mode
n
The drive enters Sleep mode after receiving a Sleep command from the host. In Sleep mode, the electronics are in low power mode, 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.
Idle and standby timers
n
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.
Seagate SkyHawk Product Manual, Rev. A
5V ± 5%
100 p-p max, 0-20 MHz
<100 ms
Heads Spindle
Tracking Rotating
Tracking Rotating
Floating Rotating
Parked Rotating
Parked Stopped
Parked Stopped
Electronics
Full power
Partial Power
Partial Power
Partial Power
Low Power
Low Power
Drive Specifications
12