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Hardware and Windows Vista Hardware issues in relation to Windows Vista. (microsoft.public.windows.vista.hardware_devices)

IDE Controler CMD 0649 PIO Mode 4 only



 
 
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  #1 (permalink)  
Old September 17th 06, 10:27 AM posted to microsoft.public.windows.vista.hardware_devices
Flash
external usenet poster
 
Posts: 5
Default IDE Controler CMD 0649 PIO Mode 4 only

I use the IDE Controller CMD 0649 chipset for my DVDRRW optical rives the
controller is capable of ATA 100. Device Manager shows it as PIO mode 4 &
the Enable DMA box is disabled.
Editing the registry manually I am able to change to DMA mode but it resets
upon a reboot.
  #2 (permalink)  
Old September 17th 06, 06:48 PM posted to microsoft.public.windows.vista.hardware_devices
Cari \(MS-MVP\)
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Posts: 1,515
Default IDE Controler CMD 0649 PIO Mode 4 only

First thing to check is that you have an 80 wire cable and not an old 40
wire.
--
Cari (MS-MVP)
Windows Technologies - Printing & Imaging
http://www.coribright.com/windows

"Flash" wrote in message
...
I use the IDE Controller CMD 0649 chipset for my DVDRRW optical rives the
controller is capable of ATA 100. Device Manager shows it as PIO mode 4 &
the Enable DMA box is disabled.
Editing the registry manually I am able to change to DMA mode but it
resets
upon a reboot.



  #3 (permalink)  
Old September 17th 06, 11:23 PM posted to microsoft.public.windows.vista.hardware_devices
Peter M
external usenet poster
 
Posts: 172
Default IDE Controler CMD 0649 PIO Mode 4 only

PIO 4 is actually multi-word dma 2 which is what many optical drives still
only run at.

"Flash" wrote in message
...
I use the IDE Controller CMD 0649 chipset for my DVDRRW optical rives the
controller is capable of ATA 100. Device Manager shows it as PIO mode 4 &
the Enable DMA box is disabled.
Editing the registry manually I am able to change to DMA mode but it
resets
upon a reboot.


  #4 (permalink)  
Old September 18th 06, 07:30 AM posted to microsoft.public.windows.vista.hardware_devices
Flash
external usenet poster
 
Posts: 23
Default IDE Controler CMD 0649 PIO Mode 4 only

Firstly I must point out that I have Dual Boot and am running XP Pro on the
same PC for 2 years without any DMA issues
I have six DVDRW drives in the system using 3 IDE controllers all with 80
wire ATA-133cables
4 drives should operate at Ultra DMA Mode 2 & two should operate at Ultra
DMA Mode 4. They operate successfully at these settings when I boot up into
XP Pro.
In PIO mode 4 excessive CPU usage is noticed and the writing speed is
restricted to 4x, this is as expected with PIO mode
Using a Pioneer burner on the M/B IDE channel I can get the correct Ultra
DMA Mode 4, but unfortunately I do not have any spare IDE on my M/B

The issue is with the controller drivers supplied with the OS and not the
hardware set up
--
Visit my Pioneer Firmwares site
http://flashman.rpc1.org
Read my reviews at
http://www.dvd-recordable.org

 




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