Re: ATA failure with 4.6.2 & 250GB drive?

freebsd-stable_at_freebsd.org
Date: 10/16/03

  • Next message: Jason Dictos: "RE: Help with build world - Results" 
    To: freebsd-stable@freebsd.org
Date: Thu, 16 Oct 2003 15:45:08 +1000

    > > FWIW, I have had _major_ problems (ie drive failure) when trying to use
    > > an 80 wire cable on a UDMA33 board with an ATA66 drive - I would recommend
    > > never using 80 wire cables on controllers that don't support UDMA66 or
    > > better. The reverse, using 80 wire cables on UDMA66 (or better) controllers
    > > with ATA33 drives is ok, however, and I've done that successfully.
    >
    > The only difference between 40 and 80 wire ATA cables are the extra 40
    > wires which are all connected to ground and pin 34 in the host connector
    > which is not connected to the conductor in an 80 wire cable. The ANSI
    > ATA/ATAPI-5 standard says that "80-conductor cable assemblies may be used
    > in place of 40-conductor cable assemblies to improve signal quality ..."
    > (section 4.2.2.1).
    >
    > Unless someone can suggest a specific mechanism for the drive failures,
    > I would expect that your correlation between drive failures and using
    > 80 conductor cables with UDMA33 controllers was just coincidence.

    Thanks for the feedback. In that case, it may be that I had a dud cable -
    when I tested the cable at the time, it appeared to have continuity
    _between_ some pins - my assumption was that the controller coudn't handle
    that and, obviously (now), it couldn't.

    -- joel --
    AusCERT, ITS, Uni of Qld, Australia -- hotline: [+61] [07] 33654417
    my opinions in this email are not endorsed by AusCERT or Uni of Qld
    this message may not be onforwarded without my expressed permission
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  • Next message: Jason Dictos: "RE: Help with build world - Results"

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