linux-kernel - Re: Annoying problems with lacie external hd (JMicron 0x2339?)

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Date:	Sat, 3 Oct 2009 17:26:50 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Felipe Contreras <felipe.contreras@...il.com>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	<linux-usb@...r.kernel.org>
Subject: Re: Annoying problems with lacie external hd (JMicron 0x2339?)

On Sat, 3 Oct 2009, Felipe Contreras wrote:

> Hi,
> 
> This is with 2.6.31.1.
> 
> I'm having a lot of problems with a lacie external hd[1]. It seems the
> actual disk is a seagate ST375064, and the bridge is a JMicron 2339.
> 
> In normal usage what I see is that if I don't use the disk after a
> while hear a loud click (as if something got stuck) and then I cannot
> use it any more; I have to turn it off and on again.

This sounds very much like a hardware problem, either in the drive or
in the bridge chip.  There's no direct way to tell which; you would
have to try attaching the drive to a different chip or the chip to a
different drive.

The two places where your listings showed the Serial number (the kernel
log and the /sys/kernel/debug/usb/devices file) have different values,
suggesting that the chip is at fault.  But this isn't definitive.

Alan Stern

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