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From: Abel Alejandro (elecchatpr.org)
Date: Wed Apr 25 2001 - 05:43:37 CDT

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    EM> Could you please post your dmesg output? Then one could diagnose if it's a
    EM> chipset with broken UDMA support (like mine).
    dmesg as attachment...

    EM> After using

    EM> wd* at wdc? channel ? drive ? flags 0x0f00
    EM> wd* at pciide? channel ? drive ? flags 0x0f00

    EM> to disable UDMA for my harddisk the system runs stable as a rock under obsd2.8.

    Tests with wd* flags 0x0ffc gave same results as usual. Now I'm going
    to perform test with 0x0ff8 which is, as I think, the proper setting
    to force PIO mode 0, the lower and the slowest mode possible to use.
    This mode, as I see righ now, is painfully slow and probably I will
    look for another hardware...

    I'm wondering how OpenBSD behaves with defective hd's. Maybe this is a
    problem. I had to use Western Digital's disk utility in order to remap
    some bad sectors. What if there showed new ones? Nevertheless it
    doesn't explain exactly same behaviour with this suspicious drive
    removed from machine... Hmmm, but what if the second one is also
    defected...

    Andrzej