From owner-freebsd-usb@FreeBSD.ORG  Tue Feb 19 23:26:13 2008
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From: Marcel Moolenaar <xcllnt@mac.com>
To: =?UTF-8?Q?=C5=81ukasz_Sromek?= <lukasz.sromek@gmail.com>
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Date: Tue, 19 Feb 2008 15:26:08 -0800
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Cc: freebsd-usb@freebsd.org
Subject: Re: Copying to usb flash drive corrupts files
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On Feb 19, 2008, at 3:12 PM, =C5=81ukasz Sromek wrote:

> So I thought, maybe just reading is broken somehow. I've booted
> freebsd again, mounted usb stick and copied some files. But when I
> tried to read them under windows I got errors.

We've ran into a bad USB-NAND flash controller revision
here at work that resulted in lost writes. The problem
was that a SYNCHRONIZE_CACHE command would stall the USB
device, which we then cleared correctly, but a prior
write would not hit the NAND flash.

An USB analyzer would give us the information we need...

FYI,

--=20
Marcel Moolenaar
xcllnt@mac.com