[GRLUG] Interesting problem with 2.5" backup drive

[Bob Kline]

On Tue, Apr 27, 2010 at 9:42 PM, John-Thomas Richards <jtr at jrichards.org>wrote:

> On Tue, Apr 27, 2010 at 04:05:46PM -0500, L. V. Lammert wrote:
> > At 03:17 PM 4/27/2010, you wrote:
> > >Is it in a USB enclosure?
> >
> > Just found the problem - looks like the USB port on ONE machine is
> > underpowered - tried the disk on a 3rd Linux machine (netbook) and it
> > mounted with no problem!
>
> That makes sense.  My USB cable for my external drive has an extra plug
> in case one does not provide enough power.  Cool.  Glad you figured it
> out.
>

I have a USB CD-DVD unit like that - two
plugs.  Oddly, it specifies not using a powered
USB hub, which makes more sense to me.
I have an HP printer plugged in to a powered
hub, and it works just fine.  In this case it's
not for the power - it has its own power supply.

So I'm not totally clear about what goes on
here.  Maybe the second plug only taps power,
and not signal? But even then, a powered
hub would seem to work with a single ended
cable....

    -- Bob
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