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Thread: From DMA to PIO

  1. #1
    From DMA to PIO
    cowbrain's Avatar
    Member Since
    Apr 05, 2009
    Location
    London UK
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    139
    Specs:
    MBP 2.9GHz i7, 16GB DDR, 512GB, , MB black 2.4GHz core two duo, 4GB RAM, 500gb hdd (7200 rpm) 10.6.8
    From DMA to PIO
    Hello,

    Macbook working well on OS X side of things, but all video and audio stuttering on Windows (Boot Camp XP SP3)

    I see (in Device Manager) that the Primary IDE has switched from DMA to PIO - which would cause this problem. I have read pages (on other forums) which describe fixes which involve going into the registry and changing values - I'm slightly nervous about this. (Did it once before, years ago on a Windows PC and got it wrong!)

    So, two questions, please:

    1: Anyone familiar with this problem and know of a quick fix?

    2: If I do have to go into the registry, is Boot Camp Windows the same as regular Windows (I'd be printing up and following instructions)

    Thanks, CB
    MBP 2.9GHz i7, 16GB DDR(Crucial), 512GB SSD (Crucial M550) OSX 10.9.5
    Macbook black, 2.4GHz core2duo, 4GB ram, 500GB HDD(7200rpm), OS X 10.6.8
    iPhone 4S

  2. #2
    From DMA to PIO
    bobtomay's Avatar
    Member Since
    Dec 22, 2006
    Location
    Texas, where else?
    Posts
    26,210
    Specs:
    15" MBP '06 2.33 C2D 4GB 10.7; 13" MBA '11 1.8 i7 4GB 10.10; 21" iMac '13 2.9 i5 8GB 10.10; 5s & 5c
    It is no different.

    "Assuming" that you have inserted your OS X disc under Windows and installed the Bootcamp drivers - along with all available updates, the next thing to try is:

    1) Right click on My Computer
    2) Click on Device Manager.
    3) Expand the IDE controllers and right-click on the secondary IDE channel.
    4) Click on uninstall.
    5) Do the same for the primary IDE channel.
    6) Now restart your computer.

    (I think that is right, I'm not running an XP machine at home any longer.)
    I cannot be held responsible for the things that come out of my mouth.
    In the Windows world, most everything folks don't understand is called a virus.

  3. #3
    From DMA to PIO
    cowbrain's Avatar
    Member Since
    Apr 05, 2009
    Location
    London UK
    Posts
    139
    Specs:
    MBP 2.9GHz i7, 16GB DDR, 512GB, , MB black 2.4GHz core two duo, 4GB RAM, 500gb hdd (7200 rpm) 10.6.8
    Thanks bobtomay, this worked a treat.

    I'd read this on another page, just after posting my question. Only difference in procedure was that I only uninstalled the primary IDE (the only one using PIO) - and not the secondary.

    All seems to be working - but have I missed out a vital step by not uninstalling secondary IDE - then primary IDE?

    Thanks again for speedy and accurate response. Much obliged. CB
    MBP 2.9GHz i7, 16GB DDR(Crucial), 512GB SSD (Crucial M550) OSX 10.9.5
    Macbook black, 2.4GHz core2duo, 4GB ram, 500GB HDD(7200rpm), OS X 10.6.8
    iPhone 4S

  4. #4
    From DMA to PIO
    bobtomay's Avatar
    Member Since
    Dec 22, 2006
    Location
    Texas, where else?
    Posts
    26,210
    Specs:
    15" MBP '06 2.33 C2D 4GB 10.7; 13" MBA '11 1.8 i7 4GB 10.10; 21" iMac '13 2.9 i5 8GB 10.10; 5s & 5c
    If everything is showing as DMA, you should be ok.

    I just always removed both when I had this issue.
    I cannot be held responsible for the things that come out of my mouth.
    In the Windows world, most everything folks don't understand is called a virus.

  5. #5
    From DMA to PIO
    cowbrain's Avatar
    Member Since
    Apr 05, 2009
    Location
    London UK
    Posts
    139
    Specs:
    MBP 2.9GHz i7, 16GB DDR, 512GB, , MB black 2.4GHz core two duo, 4GB RAM, 500gb hdd (7200 rpm) 10.6.8
    Many thanks.

    Yeah, all showing DMA settings now

    As if to celebrate, the sun has come out, too (Sunday afternoon, UK). Maybe that's controlled by Windows, too?

    Thanks again, bobtomay. Great stuff!

    Cheers, CB
    MBP 2.9GHz i7, 16GB DDR(Crucial), 512GB SSD (Crucial M550) OSX 10.9.5
    Macbook black, 2.4GHz core2duo, 4GB ram, 500GB HDD(7200rpm), OS X 10.6.8
    iPhone 4S

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