From owner-freebsd-current@FreeBSD.ORG Tue Jun 3 15:01:18 2003 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 3F6F237B408; Tue, 3 Jun 2003 15:01:18 -0700 (PDT) Received: from dan.emsphone.com (dan.emsphone.com [199.67.51.101]) by mx1.FreeBSD.org (Postfix) with ESMTP id 3748F43F3F; Tue, 3 Jun 2003 15:01:17 -0700 (PDT) (envelope-from dan@dan.emsphone.com) Received: (from dan@localhost) by dan.emsphone.com (8.12.9/8.12.9) id h53M1GWe081601; Tue, 3 Jun 2003 17:01:16 -0500 (CDT) (envelope-from dan) Date: Tue, 3 Jun 2003 17:01:16 -0500 From: Dan Nelson To: Andreas Klemm Message-ID: <20030603220116.GB26246@dan.emsphone.com> References: <20030603055718.GA4763@titan.klemm.apsfilter.org> <20030603062335.GA8702@dan.emsphone.com> <20030603063015.GA5311@titan.klemm.apsfilter.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20030603063015.GA5311@titan.klemm.apsfilter.org> X-OS: FreeBSD 5.1-BETA X-message-flag: Outlook Error User-Agent: Mutt/1.5.4i cc: current@freebsd.org Subject: Re: whats an UDMA ICRC error ? X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 03 Jun 2003 22:01:18 -0000 In the last episode (Jun 03), Andreas Klemm said: > On Tue, Jun 03, 2003 at 01:23:35AM -0500, Dan Nelson wrote: > > In the last episode (Jun 03), Andreas Klemm said: > > > ad2: UDMA ICRC error cmd=read fsbn 74689079 of 74689079-74689206 retrying > > > ad2: UDMA ICRC error cmd=read fsbn 74689079 of 74689079-74689206 retrying > > > > > > What exactly does an UDMA ICRC error mean ? I think this is > > > simply a read error. AFAIK an IDE disk doesn't have spare sectors > > > or am I wrong ? How severe is this error ? What do you think ?? > > > > An ICRC error is an error detected by the IDE controller. It > > usually means a cabling problem, as a disk error would be reported > > by the drive, not the controller. From the ATA spec: > > > > ICRC shall be set to one if an interface CRC error has occurred > > during an Ultra DMA data transfer. The content of this bit is > > not applicable for Multiword DMA transfers. > > > > There are other error bits that indicate uncorrectable media errors. > ^^^^^^^^^^^^^^^^^^^^^^^^^^ > Does this mean, that data corruption occurred ?? No; I'm just saying that the ATA spec has a lot of status/error bits :) If you had physical data corruption you'd see something other than ICRC. -- Dan Nelson dnelson@allantgroup.com