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Enabling DMA in Win98SE, not possible.. ??

M

Mavrick007

Diamond Member
I have tried enabling DMA in Win98SE for my DVD-rom and from reading the other post where the guy didn't know how to do this, it doesn't explain why mine doesn't work. I have gone to the device manager and clicked on DMA, it asks to reboot and when I check it after a reboot, it's not checked again. No idea why.. Anyone?
 
Do you have DMA enabled in your BIOS? Double check that you have it enabled for both the IDE channels, and then give it a go again.

--Mark
 
Sure, here's the crappy system specs on this machine.

Asus P5a "super 7" board
AMD K62/350
256Megs pc100/133 ram
32Meg CL TNT2 Ultra AGP
Maxtor 27.3Gig hd primary master
Toshiba 12x dvd-rom secondary master
SB Live!
3com nic
Hollywood+ dvd decoder
 
I just checked my bios.

IDE Ultra DMA is set to Auto (only no or Auto)
ECP DMA is set to 3
FC DMS is set to 1
DMA for 1 for ISA is set to no
DMA for 3 for ISA is set to no
(I think the ISA part is only if I wanted to run DMA on my isa cards, which I don't cause I only have a modem and I don't even use it)

These are the only DMA settings in the bios, so I don't know what else it could be. The faq I read says that DMA is not dependant on the bus setting so it shouldn't matter if my board can do ata33/66 or whatever. There are a few checkboxes in the device manager for the dvd-rom but the DMA box always stays unchecked after I reboot.
 
An issue that I completely over looked a hwile back while trying to enable DMA, was my cables. You've got to have DMA 66+ cables to be able to enable and keep it enabled...
 


<< An issue that I completely over looked a hwile back while trying to enable DMA, was my cables. You've got to have DMA 66+ cables to be able to enable and keep it enabled... >>


Are you sure, WhoDeeny? I read a faq and it said that it didn't matter whatever it was for DMA access.

<< You can enable DMA, independent of what mode the hardware is physically connected at, ie you can enable DMA mode on a CDROM drive that is connected at PIO 4. >>

My board supports ata33 and I don't think it will support ata66 so according to the faq it shouldn't matter what mode the DVD drive is in and therefore it shouldn't matter what cable is being used either.. because if the board can only do ata33 then an ata66 80wire cable will not help it at all.
 


<< Are you sure, WhoDeeny? I read a faq and it said that it didn't matter whatever it was for DMA access. >>



Absolutely certain with respect to the fact that I had 40 wire cables and for DMA you need 40 wire...
 


<<

<< Are you sure, WhoDeeny? I read a faq and it said that it didn't matter whatever it was for DMA access. >>



Absolutely certain with respect to the fact that I had 40 wire cables and for DMA you need 40 wire... >>



yes, i had the same problem before. And changing the cable to the 80 pins one did fix the problem.
 


<< Are you sure, WhoDeeny? I read a faq and it said that it didn't matter whatever it was for DMA access. >>





<< Absolutely certain with respect to the fact that I had 40 wire cables and for DMA you need 40 wire... >>


I believe you mean you had a 40 wire cable and then you switched to an 80 wire cable cause that's what you need for ata66/100/133.



<< yes, i had the same problem before. And changing the cable to the 80 pins one did fix the problem. >>



Ok, I just checked some settings and stuff online. My Asus P5a will only do UDMA 33 and my hd is ata66. I just enabled DMA on both my hd and my DVD. I rebooted and then checked out the settings. My hd is still checked, but my DVD is not checked. Both of them have the same type cable (standard 40 pin 40wire cable) but I don't get DMA out of the DVD, just the hard drive. Explain the reason for this. The DVD should be DMA capeable cause it's definitely less than a 2 year old model.
 
80 wire IDE cable is only needed for ATA66 and 100. A 40 wire cable is what is used on an ATA33 drive. Nothing to do with DMA working or not. In device manager, is the DMA checkbox visable?
 


<< 80 wire IDE cable is only needed for ATA66 and 100. A 40 wire cable is what is used on an ATA33 drive. Nothing to do with DMA working or not. In device manager, is the DMA checkbox visable? >>


Yes, that's what I said about the ata33 which doesn't need anything more than a 40wire cable but you can still get DMA out of it.
In the device manager, the DMA checkbox is visible for both the hard drive and the DVD rom. I enabled both at the same time and when I rebooted, the checkboxes were still visible but only the hard drive was still checked.
 
I have a p5a, there is no way that I could find to get DVDs to stick in win98 with DMA. Its probably a board problem, HDs will work though.
 
Hehe oic I was curious why mine wouldn't give me DMA with a DVD but it did with my hard drive. That might be the reason mine doesn't give DMA.. man, that just sucks.

I would like to know if anyone else got DMA to work with a P5a though, but something tells me that they didn't.
 
This might help you. It's taken from someone's post over in Via Arena:

--------------------------------------------------------------------------------------------------------
Thanks Alex, you're a real lifesaver!

SIMON

"Alexander Grigoriev" <alegr@earthlink.net> wrote in message
news:IqDN7.15005$WC1.1784111@newsread2.prod.itd.earthlink.net...
> The driver has a nasty habit of falling to PIO and staying there.
> Open REGEDIT, find the following keys:
>
> HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E96A-E325
> -11CE-BFC1-08002BE10318}\000x
> Last four digits are likely 0001, 0002. Under those keys you will find
> MasterIdDataChecksum, SlaveIdDataChecksum. Delete the value
> corresponding to your drive. It will make the OS to redetect the device
> DMA capabilities after reboot.
>
> "Simon Tan" <kengsim@pc.jaring.my> wrote in message
> news:9u6r450256m@enews4.newsguy.com...
> > I'm running XP Pro with my KG7-R. I've an AOpen 52X CDROM and a
> 1240DVD.
> > Initially, both ran under DMA mode. Then I flashed the DVD firmware to
> a
> > region-
> > free one. Upon bootup, XP detected the DVD again, but this time, the
> CDROM
> > became PIO mode only. Last night, I dumped the DVD ROM and put in a
> ASUS
> > E616, and now both the CDROM and the DVD ROM are running in PIO mode!
> > Trying to switch them to DMA mode in Device Manager is no use. The
> settings
> > stay on PIO mode. (I know where and how to set the mode, but it's not
> > working)
> >
> > This is how they are connected :
> >
> > IDE 1 (M) - Aopen 52X CDROM
> > IDE 1 (S) - Asus E616 DVDROM
> > IDE 2 (M) - Yamaha CRW2200E
> > IDE 2 (S) - None
> >
> > How do I get XP to put them back to DMA mode? Any ideas?

 
I have Toshiba DVD, model SD-M1502, which was the best one a couple months ago, but I forget the speed 12x or 16x, anyway it doesn't support UDMA only PIO, but otherwise seems to work fine.
 
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