[Gllug] Backup drive for CentOS 5 remote setup

[Andrew Farnsworth]

On Tue, Aug 17, 2010 at 1:15 PM, Christopher Hunter <cehunter at gb-x.org>wrote:

> On Tue, 2010-08-17 at 09:32 +0100, John Hearns wrote:
> > One small caveat about USB powered drives - make sure to either use
> > the lead which comes with the drive, or a thick cable.
> > I have one portable drive which does not work unless you use a chunky,
> > short cable. I assume this is due to a voltage drop over a
> > thin cable.
>
> I have a Samsung portable DVD drive that gets over that problem by
> having a Y-shaped cable that plugs into two USB slots on my computer!
>

This was a very common solution to the power problem in the early days, even
with external Hard drives as they often used too much power... things are
better today and the drives and interface conversion chips (usb to
SATA/PATA) use much less power, keeping them in the envelop for USB powered
devices.

One thing you should watch out for with your two USB port solution is that
sometimes (especially older) laptops didn't fully follow the spec and
assumed you would only use one powered device so they share the power
between ports rather than supplying full power to each port.


Andy
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