UDMA Question
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Thread: UDMA Question

  1. #1
    Join Date
    May 2000
    Whistler BC

    UDMA Question

    How can I tell if my HD is using ATA-33?
    The HD (quantum fireball lm-plus) supports ATA-66, but my mobo (elitegroup P5SD-B+) only supports 33. I have connected the HD with a standard 40 pin cable (less than 18 inches). All drivers that came w/ the mobo have been installed, but there was no Bus Mastering driver, just a PCI IRQ router and some USB router.

    The DMA box will not stay checked in the HD properties.

    POST screen says C: drive ...... UDMA

    HD Tach reports that the drive has read speed of 8 and seek time of 12 (I forget the units of measurement....), which is not significantly faster than the old PIO 1 gig drives I used to use (was 10+16, if I remember correctly).

    There was some Debug routines that I found on the net (I forget the URL) that apparently indicate the drive supports up to UDMA 4 (Which I already knew), but since I know that the mobo only supports up to UDMA 2, I suspect this means nothing.

    My main concerns are a) the DMA box - isn't this necessary? and b) the HD Tach results - I'm no expert, but this wasn't the type of performance increase I was expecting between PIO 4 @ 5400rpm and UDMA 2 @ 7200 rpm.

    Please advise...


  2. #2
    Join Date
    Mar 2000
    Newcastle, England
    You won't be able to enable DMA unless you set the drive to UDMA-33. You can normally do this by setting a jumper on the back of the drive or by using some software. Have a look at Quantum's site. They should have a utility to change the UDMA mode.


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