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    SubjectRE: (U)DMA Explained (Re: Kernel freeze on boot (.123-.125) in I

    On 22-Oct-98 Andre M. Hedrick wrote:
    > On Wed, 21 Oct 1998, Daniel Nash wrote:
    >> hda: IBM-DAQA-33240, 3098MB w/96kB Cache, CHS=787/128/63, DMA
    >> hdb: WDC AC31600H, 1549MB w/128kB Cache, CHS=787/64/63, DMA
    > First Question:
    > Are IBM-DAQA-33240 and WDC AC31600H are UDMA by default???
    > If they are, you need to move them off the 430HX PIIX3.
    > This silly controller thinks that it can do UDMA, because it can decode
    > the difference in the hardware. However, you would have seen (U)DMA if
    > you could turn off in the BIOS timing settings.

    Both are older, non-UDMA drives. That's why I left them on the motherboard.

    > What is the mainboard nad bios revision?

    Abit IT5H rev 1.5 I'll check the BIOS revision when I get home later.

    >> hde: IBM-DHEA-38451, 8063MB w/472kB Cache, CHS=16383/16/63, UDMA
    > There are now three DMA reporting states of IDE-devices.
    > A trailing tag with UDMA is considered, 100% native.
    > A trailing tag with (U)DMA is considered, native capable (forgot to enable)
    > A trailing tag with DMA is considered, straight Multi/Single Word native.
    > There are currently no reporting point to date that report the mode level.
    > That is DMA can be DMA mode 2/1/0 as multi or single word, thus 6 possible
    > mode levels are blanketed under this trailing TAG. Note that (U)DMA is
    > reverted to any of these mode levels, also. UDMA will be UDMA mode 2/1/0,
    > thus 3possiblemode levels are blanketed under this trailing TAG.

    Ok, are you suggesting that I should somehow find out which mode is correct
    for each drive and set it with something like hdparm? How might I do this?

    -- Daniel Nash
    "Waiter, Waiter, there's an avocado in my guacamole." - Me

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