I have a machine, running 1.5Q with 16 IBM dtla-307075 disks in it,
running at udma mode 1, and I only get crc errors on one of the drives.  I
have not yet swapped out the cable to see if that is the problem.  However,
we were getting many many many errors on these drives with any cables
longer than 24 inches.  Shortening the cables to 18 inches made an amazing
difference in performance.  Of course it did terrible things to the
physical appearance of the rig.
-Brian
On Feb 22,  6:04pm, Jukka Marin wrote:
} Subject: Re: wd0 error again...
} On Tue, Feb 20, 2001 at 12:48:42PM +0100, T@W wrote:
} > Manuel Bouyer encoded:
} > >On Mon, Feb 19, 2001 at 06:09:53PM +0100, Roine Thunberg wrote:
} > >>
} > >> Hi... I've just put in another drive exactly the same model... so now I
} > >> have two 30.7GB drives.
} > >>
} > >> -----
} > >> wd0: transfer error, downgrading to Ultra-DMA mode 1
} > >> wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 1 (using DMA data
} > >>transfers)
} > 
} > [snip]
} > 
} > Tried another kernel? (best bet: GENERIC)
} 
} What disk is this?  My (1.4.2) system has always had serious problems with
} IBM-DTLA-307030, no matter what IDE cables I use etc.  I haven't found a
} solution, I'm going to move the disk to a new machine soon.  When accessing
} the disk, I'm getting lots of
} 
} wd0e:  aborted command, interface CRC error reading fsbn 11674016 of
} 11674016-11674143 (wd0 bn 11674016; cn 11581 tn 5 sn 53), retrying
} wd0: soft error (corrected)
} wd0: transfer error, downgrading to PIO mode 4
} 
} (And now I got an error even in PIO mode..)
} 
}   -jm
>-- End of excerpt from Jukka Marin