On Saturday 22 April 2006 04:06 am, Al wrote:
> <snip>
>
> > I have such a hard drive ( that works fine ) but you trouble me with
> > this two usb thing. Basically the lead offers two ways you can connect,
> > one for when you are supplying power to the hard drive directly and the
> > other when you are not. My point here is that I believe only one ought
> > to be connected ????? not both !
>
> I have a 2.5 inch External USB HDD.
>
> it has 1 cable from the enclosure to the PC
> at the PC end, it splits into 2 USB plugs
> plug into 2 seperate USB ports on the PC
> 1 for data & power, 1 for extra power if needed.
>
> Sometimes you can get away with plugging in only data/power cable
> sometimes you need both
>
> Unfortunately, I've never tried to use it in Linux. (I just got it today
> from a friend).
>
> At his place, only needs to plug into 1 USB port
>
> Here, at home, I need both.  It depends on the PC
>
> HTH
>
> Al
it depends on the amount of powr the drive uses and how heavy the port is 
loaded. A port can have a power draw of up to 500 miliamps [total]
>
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