Turn on DMA

January 26, 2010 at 16:01:01
Specs: Windows 7, Pentium T4300
How do i turn on DMA for my DVD drive?

The Device Manager does not list any channels under IDE.

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January 26, 2010 at 17:50:01
Normally bios selects it if you set to auto. Might look there for settings.

Could you have a sata drive?

Playing to the angels
Les Paul (1915-2009)

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January 26, 2010 at 18:59:26
"The Device Manager does not list any channels under IDE."

It should, if it's the same situation as in Vista.
I'm assuming you opened up the IDE category - it's closed by default.

If you installed Windows 7 from a regular DVD, did you install the drivers for the system?
If you didn't, Windows doesn't have enough information about the capabilities of the mboard's main chipset. In that case, both your hard drives and optical drive(s) may be running a lot slower than they are capable of.

Whenever you load Windows from a regular Windows CD (or DVD) from scratch, after Setup is finished you must load the drivers for the mboard, particularly the main chipset drivers, in order for Windows to have the proper drivers for and information about your mboard hardware, including it's AGP or PCI-E, ACPI, USB 2.0 if it has it, and hard drive controller support. If you have a generic system and have the CD that came with the mboard, all the necessary drivers are on it. If you load drivers from the web, brand name system builders and mboard makers often DO NOT have the main chipset drivers listed in the downloads for your model - in that case you must go to the maker of the main chipset's web site, get the drivers, and load them.

If you have an additional drive controller on your mboard, other than the one built into the main chipset (many recent mboards do), you must install the drivers for that too.

If it's an IDE DVD drive, if it's a DVD combo drive (reads and burns both CDs and DVDs) that is capable of DVD-R or DVD+R 16X or greater burn speeds, it must be connected to an 80 wire data cable in order to reach it's full ratings.

The bios Setup may or may not have settings that determine whether the drives run in DMA (UDMA) mode - you may not see that in a brand name system bios version - if they're there, the DMA (UDMA) support is always enabled by default for all drives - if there's nothing like that, it's already enabled by default.

If you installed the mboard yourself...

80 wire IDE data cables must have the proper end connector connected to the mboard. Usually it's blue, but in any case it's the one farther from the middle connector on a 3 connector data cable.

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January 29, 2010 at 14:00:12
affirmative, it is sata... I can select ide or sata in bios, but it is limited as it is a laptop... i will try ide and see, but i doubt it... not sure how it can do ide if it is a sata drive

I will also try downloading and installing relevant updates, but it seems there is a sort of protection between windows 7 and the program i'm trying to use (guessing), which is DVDfab. On my older desktop (in the trash) I could get 'maximum' speeds only if i split the temp and final directories, the latter on a usb drive, and I was able to 'reset' the dma settings via DVDfab.

What I gather so far is that it is enabled in windows, there is a dma enabled item in registry, but not for this program. Also is slow with DVDdecryptor, whether using C: or C: + usb drive.

I hope this is not a no-no, talking about DVDfab here, but it is just an example of the problem, and DVD backup is a right, I think. At any rate, it is more pleasant to watch from the HD.

In the IDE section of DM there is an Intel Storage Matrix Manager, with no DMA options. The DVD entry has no DMA or other options. The REG entry just says that DMA is enabled, i think for the DVD, and everything.

I'm not on my personal comp at this time, so I can't say any more right now.

? - click what checkbox to turn DMA on for the DVD drive - ?
(as in winXP and previous) - dang

I didn't think to try the MS knowledge base...

later on.

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Related Solutions

January 29, 2010 at 14:08:23
no help at microsoft but indications that updated drivers are the key

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January 29, 2010 at 16:51:09
Disconnect drive, start computer and win, shut down, connect drive, start computer; if don't working: disconnect drive, connect optical drive of other manufacturer, start computer and win, shut down, disconnect other drive and connect yours.

Solution 2: install win again :o(

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January 29, 2010 at 21:28:03
You shouldn't need to install drivers, unless you didn't install any in the first place !

See Response 2 !

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February 1, 2010 at 15:15:16
It is a laptop...

There are no options under ide, as the windows site says, also...

I canged a value in the bios from sata to ide, but it did nothing to windows, i should change it back.

It seems there is no way to enable dma for my drive, so it spins faster, etc.... the point is that it should spin faster with DVDfab, which dvdfab says, and also which I have experienced with another computer, up to 3x faster, at the limit of the hard drive's capacity to save the data

there should be a simple option to do this, but there is not, perhaps a 3rd party software might help?

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February 1, 2010 at 20:28:31
The mboard's bios always enables DMA (UDMA) for all drives by default.
If you've been fiddling with bios settings regarding that, Load bios defaults there, Save settings

See Response 2!

It does no harm to try installing the main chipset drivers!

It's possible something in them got corrupted, though that seems to be quite rare, and that may explain why you have no IDE listings in Device Manager !

(I do have them, in Vista, for a recent mboard, on a friend's computer I'm working on.)

I'm assuming your mboard you're having this problem on is fairly recent.
If it isn't, the earlier Intel 8xx chipsets must have the Intel Application Acclerator loaded in order for the hard and optical drives to run at their full rated speed - the DMA info is found in Programs - Intel Application Acclerator, not in Device Manager. If that's listed on the Intel web site in the downloads for the particular 8xx chipset, then you must load it. That's not built into Windows.

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