Date   : Fri, 16 Jan 2004 21:18:59 +0000
From   : Mike Tomlinson <mike@...>
Subject: Re: HD Powre Consumption

In article <4c7195f21dinfo@...>, Sprow <info@...> writes

>In article <4007301B.4040806@...>,
>   Richard Gellman <splodge@...> wrote:
>> Someone previously was asking about power consumption of hard drives on
>> startup.
>
>Me. And I'm glad someone believed me enough to look independently.

Richard's talking about a 3.5" drive, not the 2.5" drives I was
referring to in my posts.

Example:  from Seagate's website for the current-model ST92011A 20Gb
2.5" 5400rpm drive.

"Power Requirements +5 VDC +/-5% 

Power Management (watts)         
Seek            2.4
Read/Write      2.87
Idle            0.97
Standby         0.36"

So that's 480mA when seeking, 574mA reading/writing, 194mA idling, and
72mA in standby.

The .pdf datasheet says the maximum current is 1.2A.  Presumably this is
when the drive is spinning up (it doesn't say.)  

I see no problem running this drive off a Beeb's PSU.

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