Harddisk "UDMA ICRC error..." from kernel at bootup. What does it mean?

[Markie]

----- Original Message ----- 
From: "Bill Moran" <wmoran at potentialtech.com>
To: "Rob" <stopspam at users.sourceforge.net>
Cc: <freebsd-questions at freebsd.org>
Sent: Wednesday, June 16, 2004 12:26 PM
Subject: Re: Harddisk "UDMA ICRC error..." from kernel at bootup. What does
it mean?


| Rob <stopspam at users.sourceforge.net> wrote:
| > Hi,
| >
| > A friend of mine switched from Windows XP to FreeBSD, because I
"garanteed" that FreeBSD
| > would be faster. I also want to optimize performance as much as
possible. I'm therefore
| > worried about the following messages from the kernel at bootup:
| >
| > [...snip...]
| > ad0: 16448MB <WDC WD172AA> [33420/16/63] at ata0-master UDMA66
| > ad1: 76319MB <WDC WD800JB-00CRA1> [155061/16/63] at ata0-slave UDMA66
| > acd0: CD-RW <HL-DT-ST RW/DVD GCC-4320B> at ata1-master PIO4
| > Mounting root from ufs:/dev/ad0s1a
| > ad1s5c: UDMA ICRC error reading fsbn 93787664 of 46885768-46885895
(ad1s5 bn 93787664; cn 5838 tn 3 sn 5) retrying
| > ad1s5c: UDMA ICRC error reading fsbn 93787664 of 46885768-46885895
(ad1s5 bn 93787664; cn 5838 tn 3 sn 5) retrying
| > ad1s5c: UDMA ICRC error reading fsbn 93787664 of 46885768-46885895
(ad1s5 bn 93787664; cn 5838 tn 3 sn 5) retrying
| > ad1s5c: UDMA ICRC error reading fsbn 93787664 of 46885768-46885895
(ad1s5 bn 93787664; cn 5838 tn 3 sn 5) falling back to PIO mode
| >
| > ---
| >
| > Both harddisks are on the same IDE 40-pin cable as master and slave.
| > ad0 is the FreeBSD formatted harddisk; one slice and several FreeBSD
partitions.
| > ad1 is from a former Windows XP installation, with two partitions:
ad1s5 (ntfs) and ad1s6 (msdos).
| >
| > I don't understand much of the lines above.
|
| Super-simplified: it's telling you it gets checksum erros when it tries
to
| talk to the drives at ATA66 speed, so it slows down and is then
successful.
|
| > The last line says it falls back to PIO mode due to errors with ad1s5c.
| > What does that mean? Will it use the slow 16.6 MB/s data exchange from
disk to host?
|
| Yes.  Windows is probably already running at this speed, but it just
doesn't
| bother to inform you.
|
| > Does this then also imply that both disks use PIO/slow data exchange
speed?
| > (remember: both disks are on the same cable to the motherboard).
|
| Yes.
|
| > What can I do to get things better and faster?
|
| Get an 80 conductor cable (probably).

Shouldn't they be able to use ATA33 on a 40 pin cable atleast? Try
atacontrol?

|
| > And also: is this "UDMA ICRC error" because it's a Windows/DOS
partition?
| > Would formatting to FreeBSD filesystem solve the problem?
|
| No, it's more likely because of the 40 pin cable.
|
| -- 
| Bill Moran
| Potential Technologies
| http://www.potentialtech.com
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