Re: USB power?

[Booth Martin <booth@xxxxxxxxxxxx>]

Here is a link that discusses the choices of power:

http://tinyurl.com/9arab

David Gibbs wrote:
> Folks:
>
> Anyone know why some external USB hard drive chassis need external power
> and some don't?
>
> A few months ago I bought a USB 2 drive chassis for a 2.5" laptop drive.
>  I was quite disappointed when I found out it required either two USB
> connections or a power brick (larger than the drive itself).  I returned it.
>
> The other day I found a similar drive chassis that didn't have a power
> plug.  It took it's power directly from the USB bus.  I picked it up
> ($25 at compusa) and it works fine.
>
> So my question is ... why did the first one require extra power and the
> second one doesn't?  They were both driving the same hard drive.
>
> Thanks!
>
> david