Hi Scott
Very true, this is why all of my stationary USB hubs are always self-
powered by their own AC adapter. There's only so much power a USB port
can provide.
One very nice feature of OS X is that it will let you know when this
occurs. When a USB device cannot draw the required amount of power,
you'll get a nice little dialog to that effect. You'll also get one if
for some reason the device draws too much power or if the USB port
surges.
On Mar 15, 2009, at 15:16, Scott Bresnahan wrote:
>
> Hi,
>
> There is a tidbit of Mac and USB info to share here though. Low
> voltage in a USB series can cause devices not to charge or function
> properly. What I mean by a series is a chain of connected USB
> devices that run off a single USB powered bus. So for example, if
> you have a power hungry device plugged into the keyboard, along with
> a mouse, depending on the voltage requirements of the USB device, you
> may not have enough to charge it or allow it to operate properly.
> Note that some USB drive enclosures have double USBBplugs. This is
> solely to draw extra power from the USB bus in order to power the
> hard drive.
>
> In general, My suggestion is to run such things off of a powered USB
> hub and avoid daisy chaining USB devices other than keyboard and
> mouse whenever possible..
>
> And this applies to any system.
>
> Best,
> Scott
>
>
>
>> hi does one need i wonder, to be using a iwndows
>> system to charge a
>> windows mobile PDA device?
>
> --
> --Scott
>
> >
The major difference between a thing that might go wrong and a
thing that cannot possibly go wrong is that when a thing that cannot
possibly go wrong goes wrong it usually turns out to be impossible to
get at or repair.
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