Dc Power Requirements; Power Consumption Efficiency; Table 15. Dc Power Requirements; Table 16. Power Consumption Efficiency - Hitachi 7K100 - Travelstar - Hard Drive Specifications

6.2 DC power requirements

Connection to the product should be made in a safety extra low voltage (SELV) circuits. The voltage specifications
are applied at the power connector of the drive.
Table 15: DC power requirements
Item
Nominal supply
Supply voltage
Power supply ripple (0–20 MHz)
2
Tolerance
Supply rise time
Watts (RMS typical)
Performance Idle average
Active Idle average
Low Power Idle average
4
Read average
Write average
5
Seek average
Standby
Sleep
6
Startup (max. peak)
Average from power on to ready
Footnotes:
1
The maximum fixed disk ripple is measured at the 5 volt input of the drive.
2
The disk drive shall not incur damage for an over voltage condition of +25% (maximum duration of
20 ms) on the 5 volt nominal supply.
3
The idle current is specified at an inner track.
4
The read/write current is specified based on three operations of 63 sector read/write per 100 ms.
5
The seek average current is specified based on three operations per 100 ms.
6
The worst case operating current includes motor surge.

6.2.1 Power consumption efficiency

Table 16: Power consumption efficiency
Capacity
Power Consumption
Efficiency (Watts/GB)
Note: Power consumption efficiency is calculated as Power Consumption of Low Power Idle in Watts/Capacity
(GB).
Requirements
+5Volt DC
–0.3 Volt to 6.0 Volt
1
100mV p-p max.
±5%
7–100 ms
3
100 GB 80 GB
0.0085 0.0106
Travelstar 7K100 Hard Disk Drive Specification
1.8
1.1
0.85
2.0
2.0
2.3
0.20
0.1
5.5
3.8
60 GB
0.0142
24