Seagate ST940818SM データシート

EE25.2 Series Product Manual, Rev. E

15

The drive receives DC power (+5V) through the interface connector.

Power requirements for the drives are listed in the table below. Typical power measurements are based on an 
average of drives tested, under nominal conditions, using 5.0V input voltage at 25°C ambient temperature.

Spinup power is measured from the time of power-on to the time that the drive spindle reaches operating speed.

During seek mode, the read/write actuator arm moves toward a specific position on the disc surface and does 
not execute a read or write operation. Servo electronics are active. Seek mode power is measured based on 
three random seek operations every 100 msecs. This mode is not typical.

• Read/write power and current

Read/write power is measured with the heads on track, based on three 63 sector read or write operations 
every 100 msecs.

Idle mode power is measured with the drive up to speed, with servo electronics active and with the heads in 
a random track location.

During Standby mode, the drive accepts commands, but the drive is not spinning, and the servo and read/
write electronics are in power-down mode.

Power-on to ready

 

     -20 to 85°C for extreme models (75°C for rugged models)

 

     -30 to -20°C (extreme models only)

 

     3 sigma maximum at extreme cold temperature

 
3.0 seconds

 

12 seconds

 

-

 
5.0 seconds

 

-

 

<30 seconds

Standby to ready

 

     -20 to 85°C for extreme models (75°C for rugged models)

 

     -30 to -20°C (extreme models only)

 

     3 sigma maximum at extreme cold temperature

 
3.0 seconds

 

12 seconds

 

-

 
5.0 seconds

 

-

 

<30 seconds

Spin down (secs typical at 1 to 85°C)

5.0

8.0

Spin down (secs typical at -30 to 0°C)

15

20