Seagate ST3300657SS ユーザーズマニュアル

22

Cheetah 15K.7 SAS Product Manual, Rev. A

 

 

 

[1]

Measured with average reading DC ammeter or equivalent sampling scope. Instantaneous +12V current 
peaks will exceed these values. 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 
15,000 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 1.

[4]

This condition occurs after OOB and Speed Negotiation completes but before the drive has received the 
Notify Spinup primitive.

 

 

 

 

Voltage

+5V

+12V [2]

+5V

+12V [2]

Regulation

[5]

±5%

±5% [2]

±5%

±5% [2]

Avg idle current

[1] [7]

0.34

0.58

0.35

0.58

Maximum starting current

(peak DC) DC

3

σ

[3]

0.53

1.92

0.54

1.92

(peak AC) AC

3

σ

[3]

0.98

3.82

0.86

3.98

Delayed motor start (max) DC

3

σ

[1] [4]

0.47

0.04

0.48

0.04

Peak operating current (random read):

     Typical DC

[1][6]

[1]

0.41

0.88

0.42

0.90

     Maximum DC

3

σ

[1]

0.42

0.95

0.43

0.95

     Maximum DC (peak)

3

σ

1.18

2.78

1.20

2.74

Peak operating current (random write):

     Typical DC

[1][6]

[1]

0.48

0.80

0.49

0.81

     Maximum DC

3

σ

[1]

0.49

0.83

0.51

0.82

     Maximum DC (peak)

3

σ

1.18

2.68

1.20

2.66

Peak operating current (sequential read):

     Typical DC

[1][6]

[1]

0.91

0.59

0.92

0.59

     Maximum DC

3

σ

[1]

0.93

0.60

0.94

0.61

     Maximum DC (peak)

3

σ

1.20

0.98

1.24

1.00

Peak operating current (sequential write):

     Typical DC

[1][6]

[1]

0.89

0.58

0.90

0.59

     Maximum DC

3

σ

[1]

0.93

0.60

0.94

0.60

     Maximum DC (peak)

3

σ

1.22

0.98

1.22

0.96