Seagate ST36421A, ST32112A, ST38421A Conducted noise, Voltage tolerance, Power-management modes

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10	U4 Family Product Manual, Rev. D

1.7.2 Conducted noise

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

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

•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 10 MHz.

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

1.7.3 Voltage tolerance

Voltage tolerance (including noise): 5V ± 5% and 12V ± 10%

1.7.4 Power-management modes

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

Power Mode	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 disc 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 specifiable length of time. The standby timer delay is established using a Standby or Idle command. In Standby mode, the

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Contents Product Manual Page Product Manual Page Contents Configuring and mounting the drive ATA interfaceFigures Seagate Connfidential Review Draft not for DistributionSeagate Confidential Review Draft not for Distribution Introduction Specification summary table Track-to-track seek time Msec typical Vibration, nonoperating Formatted capacity Default logical geometryLBA Mode Physical organizationRecording and interface technology Physical characteristicsDrive Specification ST38421A, ST36421A ST34311A, ST32112A Seek timeSpinup power Power specificationsPower consumption Start/stop timesOperating power and current Seek ModeRead/Write power and current Idle mode powerPower Mode Typical Watts Typical Amps RMS 12V Typical current profileCurrent amps Time seconds Power-management modes Conducted noiseVoltage tolerance Humidity Environmental tolerances Ambient temperatureTemperature gradient Relative HumidityShock Wet bulb temperatureAltitude Operating shockOperating vibration Nonoperating vibrationDrive acoustics Reliability Agency certification Safety certificationElectromagnetic susceptibility Electromagnetic compatibilityFCC verification Australian C-TickU4 Family Product Manual, Rev. D Configuring and mounting the drive Handling and static-discharge precautionsJumper settings Master/slave configuration Master/slave jumper settingsUltra ATA/66 cable Important mounting precautionsCable-select option Drive mountingMounting dimensions-top, side and end view ATA interface signals and connector pins ATA interfaceO pins and supported ATA signals ATA Interface commands Supported ATA commands Command name Command code in hex ATA-standard commandsATA-standard power-management commands Identify Drive commandCommand name ATA-standard security commandsWord Description 27-46 Drive model number 40 Ascii char Multiword DMA active and modes Description if bit is set to Bit Word Set Features command 0CH4 S.M.A.R.T. commands Code in Features Register A.R.T. CommandPage U4 Family Product Manual, Rev. D U4 Family Product Manual, Rev. D

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