Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932095AbVIDWKk (ORCPT ); Sun, 4 Sep 2005 18:10:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932096AbVIDWKk (ORCPT ); Sun, 4 Sep 2005 18:10:40 -0400 Received: from relay01.mail-hub.dodo.com.au ([203.220.32.149]:4995 "EHLO relay01.mail-hub.dodo.com.au") by vger.kernel.org with ESMTP id S932095AbVIDWKj (ORCPT ); Sun, 4 Sep 2005 18:10:39 -0400 From: Grant Coady To: Matthew Dharm Cc: Alan Stern , Jan De Luyck , USB Storage list , USB development list , linux-kernel@vger.kernel.org Subject: Re: [linux-usb-devel] Genesys USB 2.0 enclosures Date: Mon, 05 Sep 2005 08:10:08 +1000 Organization: http://bugsplatter.mine.nu/ Message-ID: <6brmh15ti5rqcb0iia4t4tg7gpm8499at9@4ax.com> References: <200509031812.54753.lkml@kcore.org> <20050904210446.GA16290@one-eyed-alien.net> In-Reply-To: <20050904210446.GA16290@one-eyed-alien.net> X-Mailer: Forte Agent 2.0/32.652 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1854 Lines: 40 On Sun, 4 Sep 2005 14:04:46 -0700, Matthew Dharm wrote: >On Sat, Sep 03, 2005 at 09:53:19PM -0400, Alan Stern wrote: >> On Sat, 3 Sep 2005, Jan De Luyck wrote: >> >> > I've posted in the past about problems with these enclosures - increasing the >> > delay seems to fix it, albeit temporarily. The further you go in using the >> > disk in such an enclosure, the higher the udelay() had to be - atleast that's >> > what I'm seeing here (I've got two of these now :/ ) >> > >> > One permanent fix is adding a powered USB-hub in between the drive enclosures >> > and the computer. Since I've done that, I've no longer seen any of the >> > problems (i've attached the 'fault' log). Weird but true, since the drives >> > come with their own powersupply. >> > >> > Hope this helps anyone in the future running into the same problem. >> >> This one certainly goes into the Bizarro file. >> >> Just out of curiosity -- when you use the powered hub, does the drive work >> even if you remove that delay completely? > >Aren't USB 2.0 hubs more "intelligent" as part of the requirement to >support 1.1 and 2.0 devices? I wonder if it's really a 2.0 drive, and if >the timing is different enough with the hub to make a difference. Fixed a USB powered (two USB plugs) Genesys based 2.5" HDD enclosure with extra 5V supply bypass capacitors, the HDD was shutting down without loss of data with a 'soft' 5V supply. Now USB drive works everywhere except a laptop with a single USB. HDD uses 700mA, USB is spec'd 500mA per socket. Some bugs are the hardware :o) Grant. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/