Seagate ST730212DE-30GB Conducted noise, Voltage tolerance Voltage tolerance including noise

2.7.2Conducted noise

Input noise ripple is measured at the host system power supply across an equivalent 15-ohm resistive load on the +3.3 volt line.

Using 3.3-volt power, the drive is expected to operate with a maximum of 70 mV peak-to-peak square-wave injected noise at up to 20 MHz.

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

2.7.3Voltage tolerance Voltage tolerance (including noise):

3.3V ± 5%

2.7.4Power-management modes

The drive provides programmable power management to provide greater energy efficiency. The drive features the following power-management modes:

Table 3:	Power-management modes
Power modes		Heads	Spindle	Buffer
Active (read/write/seek)		Tracking	Rotating	Enabled
Idle, performance		Tracking	Rotating	Enabled
Idle, low power		Parked	Rotating	Disabled
Standby/Sleep		Parked	Stopped	Disabled

•Active mode

The drive is in Active mode during the read/write and seek operations.

•Performance idle mode

The drive enters this mode once the read/write/seek activity is completed. The buffer remains enabled, and the drive accepts all commands and returns to Active mode any time disc access is necessary.

•Low power idle mode

Drive enters Low Power Idle mode from Performance Idle mode when the Advanced Power Management Level is set between 80h and FDh, and the Idle timer reaches 2 seconds (default setting). Disc is spinning and heads are parked and drive accepts all commands and returns to Active mode any time disc access is necessary.

•Standby/Sleep mode

The drive enters Standby mode when the host sends a Standby Immediate command. When the Advanced Power Management Level is set lower than 80h (default setting), the drive enters the Standby state after 2 seconds of interface inactivity. If the host has set the standby timer, the drive may also enter the Standby mode after the expiry of the standby timer. The standby timer can be set using the Standby or Idle command. In Standby mode, the drive buffer is disabled, the heads are parked and the spindle is at rest. The drive accepts all commands and returns to Active mode any time disc access is necessary.

8 Lyrion Series IDE Product Manual, Rev. F