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1.3 POWER REQUIREMENTS
D2246 disk drives operate on externally supplied dc power. DC power requirements are
listed in Table 1-1.
Table 1-1 DC Power Requirements
REQUIRED
DAMAGE
RIPPLE
VOLTAGE
TOLERANCE THRESHOLD CURRENT (PEAK TO PEAK)
+5.0V
±0.25 V
±10%
4.0A
100mV
-5.0V
±0.25 V
±10%
0.5 A
100mV
+12.0V
±0.60 V
±10%
0.6 A
100mV
-12.0 V
±0.60 V
±10%
0.5 A
100 mV
+24.0 V
±2.40 V
±10%
2.5 A*
240mV
5.0 A**
*2.5 A - average running current
**5.0 A - peak starting current (25 seconds maximum duration)
All power line voltages must be established within 500 milliseconds (ms) of power on.
Voltages must be enabled in the following order: +5 V, -5 V, ±12 V, +24 V. When power
is turned off, lines must be disabled in the reverse order: +24 V, ±12 V, -5 V, +5 V.
1.4 FEATURES
Shorter access times, high-speed data transfers, and mechanical reliability are required
for efficient computer network operations. To meet these demands the D2246 disk drive
offers the following features.
1.4.1 Enhanced Seek Time
Seek time is the time required to find requested data on the disk. The D2246 has an
average seek time of 25 milliseconds (ms), and a maximum of 50 ms.
1.4.2 Rapid Data Transfer Rate
The D2246 provides a data transfer rate of approximately 1.2 MB per second.
1.4.3 Compact Mounting
The compact size of the D2246 allows for either horizontal or vertical mounting in a
limited space. The drive's lock mechanism is easily accessible even after the drive has
been placed within a system cabinet.
The D2246 also features an integrated cooling fan that reduces space and power
requirements.
1-5
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