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CHAPTER 2
Hardware Modifications
14
200 MB Hard Disk Drive
Power Requirements 2
Power drawn for the 200 MB hard disk must be less than or equal to values shown in
Table 2-6 for each mode. All measurements are under nominal environmental and
voltage conditions. The limits include 1000-ohm pull-up resistors on all signal lines.
Table 2-6 Power requirements for the 200 MB hard disk drive
Current (amps) Power (watts)
Mode
Mean Maximum Mean Maximum
Startup (1) Not
applicable
1.30 Not
applicable
6.50
Random
operation (2)
0.50 0.60 2.50 3.00
Idle 0.30 0.38 1.50 1.90
Standby 0.20 0.25 1.00 1.25
NOTE 1 Startup values are peak values during response time of Power On to
Power Ready.
NOTE 2 Random operation values are RMS values with a 40 percent random seek,
40 percent write/read (1write in 10 reads) and 20 percent idle mode.