RE: Seagate HD not detected by FreeBSD

From: Ted Mittelstaedt (tedm_at_toybox.placo.com)
Date: 05/29/05

  • Next message: Ted Mittelstaedt: "RE: RE: Seagate HD not detected by FreeBSD" 
    To: <questions@freebsd.org>
Date: Sun, 29 May 2005 10:28:25 -0700

    > -----Original Message-----
    > From: owner-freebsd-questions@freebsd.org
    > [mailto:owner-freebsd-questions@freebsd.org]On Behalf Of Svein Halvor
    > Halvorsen
    > Sent: Sunday, May 29, 2005 4:49 AM
    > To: Ted Mittelstaedt
    > Cc: Ulf Magnusson; freebsd-questions@freebsd.org
    > Subject: RE: Seagate HD not detected by FreeBSD
    >
    >
    >
    > * Ted Mittelstaedt [2005-05-29 00:05 -0700]
    > > Wrong. Each IDE cable can have 2 devices a master and a
    > slave. So if
    > > you have 2 IDE controllers you can have master, slave,
    > master, slave
    > > for a total of 4 drives.
    > >
    > > It is not master on ide cable 1, slave on ide cable 2.
    >
    >
    > There's nothing wrong with having a primary master and a
    > secondary slave,
    > just as much as there is nothing wrong with the setup you proposes.
    > _______________________________________________
    >

    According to the UDMA/66/100/133 standard, which REQUIRES an 80-pin
    cable, a
    SINGLE drive on the bus MUST BE connected to the BLACK end connector NOT
    to
    the GREY slave connector, OR to the BLUE motherboard connector. On this
    setup
    the BLUE end connector MUST BE connected to the motherboard. The only
    time it
    is permissible to connect a drive to the GREY slave connector is when
    there
    are TWO DRIVES on the cable.

    This requirement is because of cable termination issues - at high speed,
    an
    unterminated black connector with a terminated grey connector causes huge
    amount of noise and can disrupt high speed transfers. This is the same
    issue
    as SCSI cables, by the way.

    According to the Microsoft's PC97 AND the ATA Plug and Play standard,
    (ATA-2
    and ATA-3) drive cables all must follow the Cable Select standard, AS
    MUST
    hard drives. CS removes pin 28 on the SLAVE connector.

    So on a correctly setup modern system, BOTH DRIVES have the CS jumper
    set,
    and if the drive is plugged into the black master connector it is
    automatically
    selected as master, and if the drive is unplugged from that connector and
    plugged to the grey connector it is automatically setup as a slave. Since
    the standard requires a single drive on the controller to be plugged into
    the end of the cable - for termination reasons - with CS set, by default
    the
    standard requires a single drive to be master.

    So yes, there is something wrong with a primary master and a secondary
    slave. Just because it works on a lot of motherboards, and just because
    it
    worked in the past on old incorrectly manufactured IDE cables, running
    in PIO mode, doesen't make it per-standard, and definitely doesen't make
    it
    right electrically if using CS, as per the standard. As I said already,
    motherboards take a lot of shortcuts and do a lot of non-standard things.

    Ted

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