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    Subject[PATCH] Bogus LBA48 drives

    Apparently some IDE drives (e.g. a pile of 80 GB ST380020ACE drives I have
    access to) advertise to support LBA48, but don't, causing kernels that support
    LBA48 (i.e. anything newer than 2.4.18, including 2.4.25 and 2.6.4) to fail on
    them. Older kernels (including 2.2.20 on the Debian woody CDs) work fine.

    One problem with those drives is that the lba_capacity_2 field in their drive
    identification is set to 0, making the IDE driver think the disk is 0 bytes
    large. At first I tried modifying the driver to use lba_capacity if
    lba_capacity_2 is set to 0, but this caused disk errors. So it looks like those
    drives don't support the increased transfer size of LBA48 neither.

    I added a workaround for these drives to both 2.4.25 and 2.6.4. I'll send
    patches in follow-up emails.

    BTW, this problem (incl. a small patch to fix it for 2.4.19, which doesn't work
    on 2.4.25 anymore) was reported a while ago by JunHyeok Heo, cfr.
    http://www.cs.helsinki.fi/linux/linux-kernel/2002-42/0312.html

    Gr{oetje,eeting}s,

    Geert

    --
    Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

    In personal conversations with technical people, I call myself a hacker. But
    when I'm talking to journalists I just say "programmer" or something like that.
    -- Linus Torvalds
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