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

Hey all, thanks for the suggestions.

I just timed a transfer of a 100MB file -- over: 1) USB2, and 2) a 10/100
Ethernet -- in both cases, it took about 95 seconds. (which is roughly
USB1.x speed)

But if it was a USB-specific problem, I would expect the 10/100 transfer to
take about 8 seconds -- but that was the same as the USB speed.

So this makes me think it must be the drive? I checked in the device
manager, and all is set to "DMA if available" -- is there anything else I
might try?

thanks again, -Scott

----- Original Message -----
From: <chris@idlelion.net>
To: "Alex Austin" <circuitsoft.alex@gmail.com>
Cc: <Thinkpad@stderr.org>; "RWM" <RWM@rwmann.com>
Sent: Wednesday, November 14, 2007 11:48 AM
Subject: Re: [Thinkpad] X40 HD/USB very slow?

> I'm guessing it's slow copying files to or from the internal drive. If
> that internal drive is slow enough, it could be the bottleneck in the
> transfer.
>
> What is the sustained data rate on those 1.8" drives, anyway?
>
> Chris
>
> On Wed, 14 Nov 2007, Alex Austin wrote:
>
> > From what I understand, this is about an external USB drive, which would
> > only use DMA between the drive and the USB/IDE chip, and the setting of
> > whether to use it or not is not exported to the computer.
> >
> > On Nov 14, 2007 8:56 AM, RWM <RWM@rwmann.com> wrote:
> >
> >> How about checking Device Mangler to see if the X20 HD ATA Controller
> >> has inadvertently been set to (or defaulted to) a slow speed, such as
> >> PIO Mode 0 (3.3) versus DMA-2 (16.7) or UDMA-6 (133).
> >>
> >>
> >>
> >> Scott Matthews 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?
> >>>>>
> >>
> >> --
> >> R.W. Mann & Company, Inc. >> Airline Industry Analysis
> >> Port Washington, NY 11050 >> tel 516-944-0900, fax -7280
> >> mailto:info_at_RWMann.com >> URL http://www.RWMann.com/
> >>
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> >
> >
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Received on Wed Nov 14 13:06:28 2007