Hitachi DK23EA Specifications - Page 16

The heads are unloaded during Power off, Standby, Sleep or Low Power Idle

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*4 : 3.9 Bels are the maximum sound power levels with A-weighted . This value is specified at product shipment, except during startup, seek, load, unload or stop. Clicking noise of releasing magnet latch will occur at power-on and loading operation. Also, the licking noise of locking magnet latch will occur at normal and emergency unloading operations. *5 : Caution Data reliability is not to be used to compromise the host system data backup. For the HDD evaluation, long term operation is not recommended. In case of evaluation, once or more unload operation by Power off , Standby or Sleep is recommended within twelve hours' power on time. *6: These shock specifications are defined for each axis. For non-operating rotational shock, the specification is 15K radian/sec2 or less (2 ms, half sine wave). 3.3 Drive Usage Condition Specifications The drive is designed for usage under the following conditions. Since reliability and product life depends on usage conditions, please consult our sales representatives or application engineers if the drive may be operated outside these conditions. -Power on hours (POH) : Less than 160 hours/month POH includes Sleep and Standby modes. The heads are unloaded during Power off, Standby, Sleep or Low Power Idle modes. The spindle motor is stopped during Standby and Sleep modes. -Operating (Seek/Write : Less than 20% of POH Read operations) -Motor Start/Stop Count : Max. 100,000 times. This number includes Standby, Sleep and power-on/off count. -Environment : Within environmental specifications given in Table 3.2 -Power Requirement : Within DC power requirement specifications given in Table 3.1 "Principal Specifications" -Drive Grounding : Drive frame should be grounded to system ground with four screws electrically. Grounding noise should be less than 500mVp-p. The grounding noise should be measured between electrical ground and system frame ground without the drive. Grounding AC current (measuring between two of side mounting holes) should be less than 50 mAp-p (Frequency Range: less than 20MHz). The grounding current should be measured through 50 ohm resistor. -External Magnetic Field : Within specifications given in Table 3.2 -Mounting : Mount with recommended screws and regular torque. -Physical/Electrical Interface: ATA-5 -Handling : Do not add Electrical Static Discharge, and Vibration and Shock to the drive. Do not press top cover and bottom PCBA surface of the drive. K6602637 Rev.3 02.27.01 - 16 -

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K6602637
Rev.3
02.27.01
- 16 -
*4
: 3.9 Bels are the maximum sound power levels with A-weighted . This value is specified at product
shipment, except during startup, seek, load, unload or stop. Clicking noise of releasing magnet latch will
occur at power-on and loading operation. Also, the licking noise of locking magnet latch will occur at
normal and emergency unloading operations.
*5
:
Data reliability is not to be used to compromise the host system data backup.
For the HDD evaluation, long term operation is not recommended. In case of
evaluation, once or more unload operation by Power off , Standby or Sleep is
recommended within twelve hours’ power on time.
*6
: These shock specifications are defined for each axis. For non-operating rotational shock, the
specification is 15K radian/sec
2
or less (2 ms, half sine wave).
3.3 Drive Usage Condition Specifications
The drive is designed for usage under the following conditions. Since reliability and product life depends on
usage conditions, please consult our sales representatives or application engineers if the drive may be
operated outside these conditions.
-Power on hours (POH)
: Less than 160 hours/month
POH includes Sleep and Standby modes.
The heads are unloaded during Power off, Standby, Sleep or Low Power Idle
modes. The spindle motor is stopped during Standby and Sleep modes.
-Operating (Seek/Write
: Less than 20% of POH
Read operations)
-Motor Start/Stop Count
: Max. 100,000 times. This number includes Standby, Sleep and power-on/off
count.
-Environment
: Within environmental specifications given in Table 3.2
-Power Requirement
: Within DC power requirement specifications given in Table 3.1 “Principal
Specifications”
-Drive Grounding
: Drive frame should be grounded to system ground with four screws electrically.
Grounding noise should be less than 500mVp-p. The grounding noise
should be
measured between electrical ground and system frame ground
without the drive. Grounding
AC current (measuring
between two of side
mounting holes) should be less than 50 mAp-p (Frequency Range: less than
20MHz). The grounding current should be measured through 50 ohm resistor.
-External Magnetic Field
: Within specifications given in Table 3.2
-Mounting
: Mount with recommended screws and regular torque.
-Physical/Electrical Interface:
ATA-5
-Handling
: Do not add Electrical Static Discharge, and Vibration and Shock to the drive.
Do not press top cover and bottom PCBA surface of the drive.
Caution