Hitachi DK23EA Specifications - Page 14

Average of 10,000 random seeks, Voltage 5.0V, Temperature 25

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*1 :Average time of seek is calculated under the following condition. (Read/Write ratio: Read only) Average of 10,000 random seeks, Voltage 5.0V, Temperature 25°C. Maximum time of seek is calculated under the following condition. Average of 1,000 full stroke seeks, Voltage 5.0V, Temperature 25°C. This maximum time is not included the seek time by seek retry. *2 : Periodically, during start up, the drive may perform a spin up retry operation. When this operation occurs, the start up sound will change slightly and the ready timing will also be altered from typical time. *3 : Power on to Ready time could take up to 20 seconds in case of spin up retries under certain conditions of the voltage specifications(Table 3.1) and environmental specifications(Table 3.2). *4 : For DC power input, the average current is measured at the connector of the PCBA of this drive and in the nominal condition in which the power voltage and the temperature are 5.0V and 25°C, respectively. Burst free (common mode). The average current may have some tolerance after power-on. The current measurement is recommended at 5 minutes later after power-on. Caution Voltage rise time 5 - 100 ms at power on is required for power supply. The power supply voltage must not be under below GND level ( 0 V) at power off. Caution This product is required over current protection for possible combustion due to circuit or component failure. Secondary over current protection shall be prepared by the system. The requirement of the current limitation is max. 10 A for the protection. *5 : For more information, refer to Section 6.1. *6 : This value is at Low Power Idle mode. The heads are unloaded. *7: Power mode automatically enters to Low Power Active mode after Read/Write operation. Head position is kept on the same track before this power transition. *8 : Measured during random seek , and the seek interval is 1.5 revolution times (i.e. the average latency and one revolution). *9 : Measured while reading or writing 16 sectors of data located on the same track. K6602637 Rev.3 02.27.01 - 14 -

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K6602637
Rev.3
02.27.01
- 14 -
*1
:Average time of seek is calculated under the following condition. (Read/Write ratio: Read only)
Average of 10,000 random seeks, Voltage 5.0V, Temperature 25
°
C.
Maximum time of seek is calculated under the following condition.
Average of 1,000 full stroke
seeks, Voltage 5.0V, Temperature 25
°
C.
This maximum time is not included the seek time by seek retry.
*2
: Periodically, during start up, the drive may perform a spin up retry operation. When this operation occurs,
the start up sound will change slightly and the ready timing will also be altered from typical time.
*3
: Power on to Ready time could take up to 20 seconds in case of spin up retries under certain
conditions of the voltage specifications(Table 3.1)
and environmental specifications(Table 3.2).
*4 :
For DC power input, the average current is measured at the connector of the PCBA of this drive and in
the nominal condition in which the power voltage and the temperature are 5.0V and 25
°
C, respectively.
Burst free (common mode). The average current may have some tolerance after power-on. The current
measurement is recommended at 5 minutes later after power-on.
Voltage rise time 5 - 100 ms at power on is required for power supply. The power
supply voltage must not be under below GND level ( 0 V) at power off.
This product is required over current protection for possible combustion due to
circuit or component failure. Secondary over current protection shall be prepared
by the system. The requirement of the current limitation is max. 10 A for the
protection.
*5
: For more information, refer to Section 6.1.
*6
: This value is at Low Power Idle mode. The heads are unloaded.
*7
: Power mode automatically enters to Low Power Active mode after Read/Write operation. Head position
is kept on the same track before this power transition.
*8
: Measured during random seek , and the seek interval is 1.5 revolution times (i.e. the average latency
and one revolution).
*9
: Measured while reading or writing 16 sectors of data located on the same track.
Caution
Caution