Re: [Thinkpad] X40 HD/USB very slow?

Completely random - disable WiFi in the device manager, reboot and try
again.

On Nov 14, 2007 8:31 AM, Scott Matthews <scott@turnstyle.com> wrote:

> It's a Samsung drive in an Antec enclosure -- and it's perfectly fast on
> the
> X61s.
>
> I think he was saying that his drive was only serving at 3.5MB/s -- and so
> even though he had a potential of ~20MB/s vis USB2, it was limited to
> 3.5MB/s because of his drive.
>
> I'm not quite sure what to check, but it's definitely *much* slower on the
> X20 than the X61s...
>
> Thanks, -Scott
>
>
> > I remember reading here that the T40 had an early and buggy
> implementation
> > of USB 2.0, so it wouldn't surprise me if the X40 had the same.
> >
> > However, 3.5MiB/sec is much faster than USB1. USB 2.0 has a theoretical
> peak
> > speed of 55MiB/sec, but the command overhead in the USB stack and
> storage
> > protocol makes it really closer to 20MiB/sec. Divide that by 40 (the
> speed
> > multiplier from USB1/USB2) and you get 500KiB/sec.
> >
> > What model of USB drive is it? I'm wondering what the bandwidth of the
> > USB/IDE chip used is.
> >
> > On Nov 14, 2007 7:43 AM, Scott Matthews <scott@turnstyle.com> wrote:
> >
> > > Hi all, I just plugged a fast USB2 drive into my X40. I've used the
> same
> > > drive on an X61s, and it was perfectly fast. But on the X40, it's very
> > > slow.
> > >
> > > A bit of Googling (http://forum.thinkpads.com/viewtopic.php?t=27910)
> and
> I
> > > found somebody with the same problem, and he decided that the
> bottleneck
> > > was
> > > his X40 drive -- at about 3.5MB/s (not much faster than USB1) as
> opposed
> > > to
> > > about 25MB/s for USB2.
> > >
> > > Does anybody know if the X40 drive simply can't transfer data at a
> > > reasonable speed?
> > >
> > >
> > > _______________________________________________
> > > Thinkpad mailing list
> > > Thinkpad@stderr.org
> > > http://stderr.org/cgi-bin/mailman/listinfo/thinkpad
> > >
> >
> >
> >
> > --
> > - Alex Austin
> > Circuitsoft Computer Services
> > (651) 238-9273
> > www.circuitsoftcs.com
> >
> > "...and then I visited Wikipedia ...and the next 8 hours are a blur."
> >
>
>

-- 
- Alex Austin
Circuitsoft Computer Services
(651) 238-9273
www.circuitsoftcs.com
"...and then I visited Wikipedia ...and the next 8 hours are a blur."
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