Seagate ST450MM0026 ユーザーズマニュアル

Savvio 10K.4 FC Product Manual, Rev. A

23

[1]

Measured with average reading DC ammeter. Instantaneous +12V current peaks will exceed these val-
ues. Power supply at nominal voltage. N (number of drives tested) = 6, 35 Degrees C ambient.

[2]

For +12 V, a –10% tolerance is allowed during initial spindle start but must return to ±5% before reaching 
9,936 RPM. The ±5% must be maintained after the drive signifies that its power-up sequence has been 
completed and that the drive is able to accept selection by the host initiator. 

[3]

See +12V current profile in Figure 3.

Voltage

+5V

+12V [2]

+5V

+12V [2]

Regulation

±5%

±5% [2]

±5%

±5% [2]

Avg idle current DC

[1] [8]

0.35

0.25

0.38

0.25

Advanced Idle Current

Idle_A

3

σ

0.35

0.25

0.37

0.25

Idle_B

3

σ

0.25

0.22

0.27

0.22

Idle_C

3

σ

0.24

0.10

0.27

0.10

Standby

3

σ

0.24

0.06

0.27

0.06

Transition Current

Idle_A - Active

3

σ

0.76

1.54

0.78

1.54

Idle_B - Active

3

σ

0.64

1.58

0.64

1.54

Idle_C - Active

3

σ

0.62

1.56

0.66

1.56

Standby - Active

3

σ

0.66

1.64

0.68

1.64

Maximum starting current

(peak DC) DC

3

σ [4]

0.54

0.89

0.56

0.89

(peak AC) AC

3

σ [4]

0.86

1.64

0.88

1.64

Delayed motor start (max) DC

3

σ [1] [5]

0.49

0.06

0.51

0.06

Peak operating current (random read):

     

Typical DC

[1] [7]

0.42

0.46

0.45

0.46

Maximum DC

3

σ [1]

0.43

0.48

0.47

0.47

Maximum (peak) DC

3

σ

1.06

1.54

1.10

1.54

Peak operatig current (random write)

Typical DC

0.47

0.39

0.49

0.40

Maximum DC

3

σ

0.49

0.41

0.51

0.42

Maximum (peak) DC

3

σ

1.02

1.58

1.02

1.56

Peak operating current (sequential read)

Typical DC

0.83

0.24

0.86

0.24

Maximum DC

3

σ

0.85

0.25

0.89

0.25

Maximum (peak) DC

3

σ

1.12

0.40

1.14

0.40

Peak operating current (sequential write)

Typical DC

0.82

0.24

0.85

0.24

Maximum DC

3

σ

0.83

0.25

0.87

0.25

Maximum (peak) DC

3

σ

1.04

0.46

1.06

0.44