Seagate Elite 47 ST446452W, Руководство по эксплуатации продукта

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Elite 47 Product Manual, Rev. A 21
6.0 Physical/electrical specifications
This section provides information relating to the physical and electrical characteristics of Elite 47 drives.
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’s power connector. The power requirements for single-ended models includes the internal disc
drive SCSI I/O termination. Current values are in Amperes.
Table 1: DC power requirements
Notes.
[1]
Measured with average reading DC ammeter. Instant12 V current peaks will exceed these val-
ues.
[2] A drop of –10% is permissible during initial start of spindle, and must return to ±5% before 5,357 rpm is
reached. The ±5% must be maintained after the drive signifies that its power-up sequence has been com-
pleted and that the drive is able to accept selection by the host initiator.
[3] See +12 V current profile in Figure 3.
[4] This condition occurs when the Motor Start Option is enabled and the drive has not yet received a Start
Motor command.
[5] See Section 6.2.1, “Conducted Noise Immunity.” Specified voltage tolerance is inclusive of ripple, noise,
and transient response.
[6] At power-up, the motor current regulator limits the 12 volt current to an average value of less than the
value given here, although instantaneous peaks may exceed this value. These peaks should measure 5
msec duration or less.
[7] Operating condition is defined as a third-stroke seek at OD and Read One track. A command is issued
every 0.067 seconds.
[8] No terminator power supplied to terminators by drive.
Notes
ST446452W
Single-ended
Voltage +5 V [8] +12 V
Regulation [5] ±5% ±5% [2]
Maximum operating current DC3
σ
[1] 1.0 1.8
Maximum starting current
Peak DC DC3
σ
Peak AC AC3
σ
[3]
[3] 1.0 4.8 [6]
5.12
Delayed motor start (max) DC3
σ
[1] [4] .85 .1
Peak operating current
Typical DCX
Maximum DC3
σ
Maximum (peak) AC3
σ
[1] [7]
[1] .98
1.0
1.1 1.6
1.8
2.8
Track following at
OD DCX
ID DCX [1]
[1] .97
.96 1.5
1.8
Read Track
OD DC3
σ
AC3
σ
[1] [10] 1.0
1.1 1.7
1.9
Seeking
Typical DCX
Maximum DC3
σ
Maximum (peak) AC3
σ
[1] [9]
[1] .96
1.0
1.1 1.95
2.1
2.8