Datasheet

Hitachi Global Storage Technologies
Page 3 version 1.0
Environment
Operating conditions
Temperature
5 to 55°C
1
Relative humidity
(noncondensing)
8 to 90%RH
Maximum wet
bulb temperature
(noncondensing)
29.4°C
Maximum tem-
perature gradient
15°C/hour
Altitude –300 to 3048 m
1
The system is responsible for providing
sufficient air movement to maintain a
surface temperature below 60°C at the
center of the top cover of the drive.
Non operating conditions
Temperature
–40 to 65°C
Relative humidity
(noncondensing)
5 to 95%RH
Maximum wet
bulb temperature
(noncondensing)
35°C
Altitude –300 to 12,000m
Operating shock
The drive meets the following criteria
while operating in respective condi-
tions described in the list below.
y No error occurs with a 10 G half-
sine shock pulse of 11 ms duration
in all models.
y No data loss occurs with a 30 G
half-sine shock pulse of 4 ms
duration in all models.
y No data loss occurs with a 55 G
half-sine shock pulse of 2 ms
duration in all models.
The shock test consists of ten
shocks inputs in each axis and in
each direction for a total of 60. There
must be a delay between shock
pulses that is long enough to allow
the drive to complete all of the ne-
cessary error recovery procedure.
Nonoperating shock
The drives will operate with no de-
gradation of performance after being
subjected to a shock pulses with the
following characteristics. The tests
involved trapezoidal and sinusoidal
shock wave.
Trapezoidal shock wave
y The approximate shape of the
pulse is square (trapezoidal).
y Approximate rise and fall time of
pulse = 1 ms.
y Average acceleration level =
50 G. (Average response curve
value during the time following
the 1 ms rise time and before
the 1 ms fall with a time duration
of 11 ms)
y Minimum velocity change
equals 4.23 m/s.
Sinusoidal shock wave
The shape is approximately a half-
sine pulse. The following table
shows the maximum acceleration
level and duration.
Acceler-
ation
level (G)
Duration
(ms)
All models 75 11
300 2
350 2
Rotational shock
No data loss is incurred with the
following rotational shocks applied
around the axis of the actuator pivot:
y 30,000 rad/s
2
for a duration of 1 ms
y 20,000 rad/s
2
for a duration of 2 ms
Acoustics
The upper limit criteria of the octave
sound power levels are given in Bels
relative to one pico watt and are
shown below. The measurement
method is in accordance with
ISO7779.
250 GB model
Mode
Typical
(Bel)
Max.
(Bel)
Idle
3.0 3.4
Operating
Performance
seek mode
3.4 3.7
Quiet seek
mode
3.1 3.5
120GB and 160GB models
Mode
Typical
(Bel)
Max.
(Bel)
Idle
2.8 3.2
Operating
Performance
seek mode
3.4 3.7
Quiet seek
mode
2.9 3.3
40GB and 80 GB models
Mode
Typical
(Bel)
Max.
(Bel)
Idle
2.6 3.0
Operating
Performance
seek mode
3.4 3.7
Quiet seek
mode
2.8 3.2
ATTENTION: The drive
must be protected
against electrostatic
discharge especially
when being handled.
The safest way to
avoid damage is to put the drive in
an anti-static bag before ESD wrist
straps are removed.
Drives must be shipped in approved
containers. Severe damage can be
caused to the drive if the packaging
does not adequately protect against
the shock levels induced when a box
is dropped. Consult your Hitachi
Global Storage Technologies repre-
sentative if you do not have an
approved shipping container.