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From: Hans Petter Selasky <hselasky@c2i.net>
To: maxim naumov <muxx.mailinglists@gmail.com>
Date: Mon, 25 Jun 2012 17:00:39 +0200
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Cc: freebsd-usb@freebsd.org
Subject: Re: Seagate FreeAgent GoFlex 1.5TB external HDD problems
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On Monday 25 June 2012 00:22:54 maxim naumov wrote:
> On Sun, Jun 24, 2012 at 2:33 PM, Hans Petter Selasky <hselasky@c2i.net> 
wrote:
> > Ok, then it is not a USB host problem.
> 
> I am not sure I follow. to me that just proves that the HDD doesn't
> have an irrecoverable error on a particular sector. by irrecoverable I
> mean an error that would stop the HDD working altogether until power
> cycle rather than report a sector read/write error.
> 
> the question what screws up the HDD remains. the HDD can get screwed
> up by itself due to a bug in firmware, but why doesn't it happen with
> windoze or GNU/Linux? pure luck?

Hi,

You should compare things like CPU usage and number of interrupts during data 
transfer, before we could say anything for sure.

BTW: Maximum block size for USB 2.0 under FreeBSD is 64Kbytes.

BTW: You could try to make a simple c-test program that reads and writes 
random LBA's from user-space, and see when it stops working.

--HPS