--- In "Sean Hopkins" <> wrote:
>
> On 6/6/07, Jim Jackson <> wrote:
>
> You'll need ammeters :-)
> >
>
> Should have been clearer... a techtronics multimeter ;-)
Spinning up the disk takes a very short time, so the transient should
be some miliseconds (guessing here). The point is: whatever you use
should be able to measure that current peak.
You may be able to use an oscilloscope to see if the 5V in the board
drop down when you plug the disk.
>
> > As people have hinted, there is the problem that when you start an a
> > device with an electric motor, there is a large initial, transient,
> > current that is needed to get the motor started and upto speed.
After that
> > the current drops to that quoted by the manufacturers. It is this
shart up
> > current that is probably causing your problem. You will need a psu
that
> > can provide the boards current, and this large initial motor current.
> >
>
> Yes, it does seem that pure plug and play is not going to happen right
> away... at least for a HDD. I will be sourcing a better PSU (with
someone
> that knows ammeters from voltimeters).
>
> Sean
>
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