Seagate ST318418N ユーザーズマニュアル
Barracuda 36ES2 Product Manual, Rev. B
21
6.0
Physical/electrical specifications
This section provides information relating to the physical and electrical characteristics of the Barracuda 36ES2
drive.
drive.
6.1
AC power requirements
None.
6.2
DC power requirements
The voltage and current requirements for a single drive are shown in the following table. Values indicated apply
at the drive power connector. The table shows current values in Amperes.
at the drive power connector. The table shows current values in Amperes.
Table 2:
DC power requirements
[1]
Measured with average reading DC ammeter or equivalent sampling scope. Instantaneous current peaks
will exceed these values. Power supply at nominal voltage. Number of units tested = 6 at ambient.
will exceed these values. Power supply at nominal voltage. Number of units tested = 6 at ambient.
[2]
For +12 V, a –10% tolerance is permissible during initial start of spindle, and must return to ±5% before
7,200 rpm is reached. 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.
7,200 rpm is reached. 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 +12 V current profile in Figure 2.
[4]
This condition occurs when the Motor Start Option is enabled and the drive has not yet received a Start
Motor command.
Motor command.
[5]
See Section 6.2.1 “Conducted Noise Immunity.” Specified voltage tolerance is inclusive of ripple, noise,
and transient response.
and transient response.
[6]
Operating condition is defined as 8
random block reads at 133 I/Os per second. Current and power spec-
ified at nominal voltages. Decreasing +5 volts by 5% increases +5 volt current by 4%.
[7]
During idle, the drive heads are relocated every 60 seconds to a random location within the band from
track zero to one-fourth of maximum track.
track zero to one-fourth of maximum track.
General Notes from Table 2:
1.
Minimum current loading for each supply voltage is not less than 1.5% of the maximum operating current
shown.
shown.
2.
The +5 and +12 volt supplies shall employ separate ground returns.
3.
Where power is provided to multiple drives from a common supply, careful consideration for individual
drive power requirements should be noted. Where multiple units are powered on simultaneously, the peak
starting current must be available to each device.
drive power requirements should be noted. Where multiple units are powered on simultaneously, the peak
starting current must be available to each device.
4.
Parameters, other than spindle start, are measured after a 10-minute warm up.
5.
No terminator power.
Notes
ST336938
ST336918
ST336918
ST336938
ST318438
ST318418
ST318418
ST318438
SE mode
LVD mode
SE mode
LVD mode
Voltage
+5 V
+12 V
+5 V
+12 V
+5 V
+12 V
+5 V
+12 V
Regulation
±5%
±5%[2]
±5%
±5%[2]
±5%
±5%[2]
±5%
±5%[2]
Average idle current DCX [1][7]
0.77
0.31
0.77
0.31
0.78
0.31
0.78
0.31
Maximum starting current
(peak DC) DC
0.84
2.02
0.86
2.02
0.83
2.05
0.82
2.05
Delayed motor start
(max) DC
(max) DC
0.66
0.03
0.66
0.03
0.63
0.03
0.63
0.03
Peak operating current
DCX
Maximum DC
Maximum (peak)
Maximum DC
Maximum (peak)
1.11
1.14
1.78
1.14
1.78
0.72
0.73
1.74
0.73
1.74
1.11
1.14
1.78
1.14
1.78
0.72
0.73
1.74
0.73
1.74
1.15
1.17
1.80
1.17
1.80
0.65
0.66
1.76
0.66
1.76
1.16
1.17
1.78
1.17
1.78
0.65
0.66
1.76
0.66
1.76