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Enabling DMA in XP?

By SuperCheetah · 12 replies
Apr 25, 2002
  1. Ok, I can't figure this one out. I did the steps below, but I do not have the Advanced Settings Tab when I right click. Why is this? I want to find out if my raid array is performing up to spec and make sure that DMA is enabled, but I can't seem to do this. Can anyone help me with this problem? I've installed the latest VIA IDE miniport drivers. I have a KG7-RAID board with a 1.4G Athlon, 512 Crucial CAS 2 DDR2100, 2 IBM Deskstars GXP75 60Gb Raid 0, GeForce 2 Pro, Audigy Gamer, etc. etc.

    I would greatly appreciate any help you guys could give!!!
  2. Falcon

    Falcon TS Rookie

    DMA Enabled

    Hey man,
    I may be off here but I'm fairly certain that if you have your HD's set up under a raid array or through a promise controller as a SCSI interface you would _not_ have the option of enabling/disabling DMA. That feature is only applicable to IDE devices such as a CDROM, CDRW, DVDROM or a HD(s) set up on a regular master/slave IDE setup..
    If you're using your HD as a SCSI device it should automatically be functioning as effiecient as possible - assuming of course your HD is being detected properly (I had to enable ata100 on my HD with a bootable disk that came with it).
    When your computer boots and the drives are detected it doesn't tell you they're running under dma mode?

    Hope it helps,
  3. SuperCheetah

    SuperCheetah TS Rookie Topic Starter Posts: 709

    Your right Falcon. I found this out yesterday while looking for a solution. I looked in the bios and it was set to Auto when enabling UltraDMA so I guess it already is running at its max efficiency. I'm just looking for some more tweaks to speed up my raid array, because I don't think it is up to par yet. If you know any good sites I would be greatly appreciative!

    Thanks again for your help!!!
  4. Phantasm66

    Phantasm66 TS Rookie Posts: 5,734   +7

    yeah.... i believe that if its listed under SCSI devices as a mass storage controller then the DMA option is not available... probably because IDE is not yet associated in folk's minds with mass storage yet.... this will probably change in subsequent versions of windows as onboard IDE RAID becomes more popular....

    So with mass storage being more associated with SCSI solutions, and DMA being an IDE technology, the option is not included. I imagine that, perhaps, your IDE controller is already driving the disks with DMA enabled already....
  5. TS | Thomas

    TS | Thomas TS Rookie Posts: 1,319

    Also, if you aren't using the default windows drivers the DMA options won't appear either. Well, for the most part anyway they don't, with the Intel ones for example
  6. Phantasm66

    Phantasm66 TS Rookie Posts: 5,734   +7

    actually, if you get right into the nitty gritty on a tech level, IDE is rubbish as an drive system for more than 2 or so devices... SCSI is still the superior tech....!

    IDE RAID might have reached workstations, but its a baby mass storage system. Just see a Hot Swappable RAID Level 5 SCSI array!!!! It leaves IDE standing....
  7. T-Shirt

    T-Shirt TS Rookie Posts: 289

    And only cost 1 arm & 1 Leg (2 of each for a really good system);)

    Yes It has some advanages, and some disadvanges.
  8. Phantasm66

    Phantasm66 TS Rookie Posts: 5,734   +7

    As in most of life, you get what you pay for.

  9. Rick

    Rick TechSpot Staff Posts: 4,572   +65

    So then.. Did I get what I paid for?


    3 bucks and 15 minutes.
  10. Th3M1ghtyD8

    Th3M1ghtyD8 TechSpot Paladin Posts: 664

    What is it with everyone here and that picture :D

    On a Serious Note, there is a registry value you need to enter under Win2K/XP to enable UDMA66/100 on IDE devices. I can't remember it at the moment, but I will include it in the next release of my tweaking program.
  11. Mictlantecuhtli

    Mictlantecuhtli TS Evangelist Posts: 4,345   +11

    HKEY_LOCAL_MACHINE \ System \ CurrentControlSet \ Control \ Class \ {4D36E96A-E325-11CE-BFC1-08002BE10318} \ 0000.
    Add a new DWORD value called EnableUDMA66. Set the value to 1 to enable UDMA/66. It probably has to be added to other keys, too, ie. \0001, \0002 &c
  12. Th3M1ghtyD8

    Th3M1ghtyD8 TechSpot Paladin Posts: 664

    Yeah, that is the one. It will be in the next version of my tweaking program if anyone still needs it. Anyone else got any suggestions ?
  13. TS | Thomas

    TS | Thomas TS Rookie Posts: 1,319

    That values *only* needed for Windows 2000 "without" Service Pack 2 installed.

    Service Pack 2 & XP support ATA 100/66 just fine.
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