[Thinkpad] High Power USB Port

[Jerome Paladino]

Is a powered USB hub as good of a solution as an AC adapter for the drive?
Or do they vary as well? Not a good mobile solution I know, but I usually
only use an external drive when on AC.
Jerry

> -----Original Message-----
> From: thinkpad-bounces at stderr.org [mailto:thinkpad-bounces at stderr.org]On
> Behalf Of Andrew Webber
> Sent: Sunday, February 04, 2007 11:24 AM
> To: Thinkpad list
> Subject: Re: [Thinkpad] High Power USB Port
>
>
> It's my understanding that the key is what current (A) the drive
> requires.  Some bigger drives require <500mA (I have a 100GB Seagate
> that shows 0.45A on its label, it's only 5400 RPM though).  Some
> smaller drives require >500mA (I've even seen one, I don't remember
> which, where the spec was 1.1A on startup, so presumably even a
> double-headed USB cable wouldn't be enough -- you'd need power).
>
> That said, I've heard of USB ports that deliver 1A, perhaps they're
> non-standard?  I can't find an example delivering both data and 1A
> power right now, but I know my wall charger (converts 110A to USB)
> delivers 1A.
>
>
>
> --
>  Andrew                            mailto:awebber at wwwebbers.com
>
> Sunday, February 4, 2007, 9:26:22 AM, you wrote:
>
> > On my X22/23/24, I've had no trouble with external USB drives up to 40b,
> > but the 7k 60Gb and 100Gb drives tend to require aux power.  Could be
> > I've just been lucky.  Also, FWIW, I do note anecdotally that with USB
> > drives and other accessories like Pocket PCs that the rear USB ports
> > "seem to" dish more power than the side ports.  Never put a meter on
> > them, though.
>
> > - RWM
>
> > Bruce Markowitz wrote:
>
> >> The X20-24 series had low power ports, and would not run any kind of an
> >> external drive. The X31 has high power ports, as do all the
> T4X units I have
> >> seen. The RIGHT side port on the X41 is low power, the LEFT
> port will run
> >> external drives. Go figure.
> >> ----- Original Message -----
> >> From: "Donald MacQueen" <dmacq at erols.com>
> >> To: "Thinkpad list" <Thinkpad at stderr.org>
> >> Sent: Saturday, February 03, 2007 10:49 PM
> >> Subject: [Thinkpad] High Power USB Port
> >>
> >>
> >>
> >>>I was in Circuit City today looking at a Sandisk USB drive.
> >>>
> >>>The box said that it required a "High Power USB Port".
> >>>
> >>>What is that, and how do I know if my TP has one?
>
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