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

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?
>
>
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-- 
- Alex Austin
Circuitsoft Computer Services
(651) 238-9273
www.circuitsoftcs.com
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