Date: Tue, 3 Jun 2003 17:01:16 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Andreas Klemm <andreas@freebsd.org> Cc: current@freebsd.org Subject: Re: whats an UDMA ICRC error ? Message-ID: <20030603220116.GB26246@dan.emsphone.com> In-Reply-To: <20030603063015.GA5311@titan.klemm.apsfilter.org> References: <20030603055718.GA4763@titan.klemm.apsfilter.org> <20030603062335.GA8702@dan.emsphone.com> <20030603063015.GA5311@titan.klemm.apsfilter.org>
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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
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