From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <4ADE2377.1000505@conducive.org>
Date: Wed, 21 Oct 2009 04:54:15 +0800
From: W B Hacker <wbh@conducive.org>
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To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
References: <1fed73d586d55546ac4c190148c84cb2@ladd.quanstro.net>
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Subject: Re: [9fans] usb disk error
Topicbox-Message-UUID: 8ce5b6a8-ead5-11e9-9d60-3106f5b1d025

erik quanstrom wrote:
> i don't recall getting these before.  this seems
> like new behavior.  i got 4 of these when downloading
> 4gb of pictures from a sd card.  never in
> the same place twice.  sb600 ohci controller.
>
> disk... reset: device is detached
>
> it seems that umsrecover -> umsreset -> usbcmd and
>
> 	if(usbcmd(ums->dev, r, Umsreset, 0, 0, nil, 0) < 0){
>> 		fprint(2, "disk: reset: %r\n");
>
> i don't see exactly where it is, but could this be
> a timeout issue?  that's the main difference i see
> between now and the previous time.  turning on
> debugging might not help.  there's just too much
> of it.  sometimes it's many gb of transfer before
> an error.
>
> - erik
>
>

If a new problem, it 'should' be a hardware issue. Bits, as you know as well as
anyone, do not really 'rot'.

Wots the ambient temperature, device temp, planar temp and surface
cleanliness/humidity at the area of the driving silicon and on any
sockets/conectors?

And if clean, cool, and well-connected, do the PS rail and signals look clean on
a 'scope?

Bill