Re: Impossible to enable DMA- Tried Everything.
- From: Leif Nordmand Andersen <lna@xxxxxxxxxxxxx>
- Date: Tue, 04 Oct 2005 04:24:59 +0200
Hi Steve,
> Device Type: Auto Detection
> Transfer Mode: DMA If Available
> Current Transfer Mode: Not Applicable
I've had a similar problem, I have made this to help people along :
Most people have problems burning CD's, when DMA in on, however a few
of us
burns fine with DMA on, however we experience, that the computer has a
mind of
it's own, at switches to PIO mode apparently on it's own.
I've got some good news and I have got some bad news for you.
First the bad news: I don't know why this happens, nor do I have a
permanent fix
for you!
The good news: I do have a fix, that sets your Plextor to DMA mode in
less than
4 seconds, if you follow this instruction.
I had an Asus K7M board, I had The Plextor 12/10/32a as primary on the
secondary
channel, and a CD as slave on the secondary channel. On this setup I
couldn't
run both as DMA, the system would freeze during operation, so the
Plextor was
DMA and the CD was PIO. A few days ago I upgraded to MSI K7T PRO2-a,
and on this
system both the Plextor and Cd will run DMA simultanusly.
Unfortunately on both systems the Plextor would get reset to PIO on
it's own -
usually after 'sleep' mode, some kind soul send me a workaround.
You need to find this path in your registry:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E96A-E325-11CE-BFC1-08002BE10318}
In my present setup there is 7 keys under this path:
0000
0001
0002
0003
0004
0005
Properties
In my old setup the information I needed was in Key: 0002, but when
the
workaround didn't work with my new MSI board, then I sought the reason
why, and
found, that key 0002 and 0005 (presumably installed with the new
motherboard),
had the same information, and that the new motherboard takes it's
information
from key 0005. So if this doesn't work on the default key 0002, look
into one of
the other keys, and see if the information is there too, then maybe
the system
gets the information from there - You will then have to change the
line:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E96A-E325-11CE-BFC1-08002BE10318}\0002]
to the key with the information in, which on my system is:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E96A-E325-11CE-BFC1-08002BE10318}\0005]
The information is (you can copy it, and save as DMA_ON.reg if you
want to):
-------
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E96A-E325-11CE-BFC1-08002BE10318}\0002]
"EnumPropPages32"="storprop.dll,IdePropPageProvider"
"InfPath"="mshdc.inf"
"InfSection"="atapi_Inst_secondary"
"ProviderName"="Microsoft"
"DriverDateData"=hex:00,40,99,31,33,2e,bf,01
"DriverDate"="11-14-1999"
"DriverVersion"="5.0.2183.1"
"MatchingDeviceId"="secondary_ide_channel"
"DriverDesc"="Secondary IDE Channel"
"MasterDeviceType"=dword:00000002
"SlaveDeviceType"=dword:00000002
"MasterDeviceTimingMode"=dword:00000410
"MasterDeviceTimingModeAllowed"=dword:ffffffff
"MasterIdDataCheckSum"=dword:000223db
"SlaveDeviceTimingMode"=dword:00000410
"SlaveDeviceTimingModeAllowed"=dword:ffffffff
"SlaveIdDataCheckSum"=dword:00009186
"UserMasterDeviceTimingModeAllowed"=dword:ffffffff
"UserSlaveDeviceTimingModeAllowed"=dword:ffffffff
------
The settings for:
"MasterDeviceTimingMode"
"MasterDeviceTimingModeAllowed"
"UserMasterDeviceTimingModeAllowed"
are different for UDMA, DMA and PIO mode.
If you set it like above you will get DMA on both channels, if your Cd
on the
secondary channel can run UDMA, then change the key:
"SlaveDeviceTimingMode"=dword:00008010
which is UDMA.
You could also export the Key above, and just make the necessary
changes to
"MasterDeviceTimingMode"
"MasterDeviceTimingModeAllowed"
"UserMasterDeviceTimingModeAllowed"
and leave the slave at it's present settings, then save it as a REG
file.
Once you have done this, then run the REG file, it will ask you
whether you want
to add the information to the registry, when you answer YES, you will
get a
confirmation, that the information has been added to the registry, and
then the
Plextor is in DMA mode again .... until next time it decides to go
into PIO
mode. I have a copy of DMA_ON.reg on my desktop, and I use it if the
Plextor is
in PIO mode, the change happens 'on the fly', no need to reboot.
Sorry I didn't have a permanent solution, hope this makes the pain
easier to
live with, until someone comes with a BIOS upgrade, IDE Driver or
system patch,
which permanently solves the problem.
I DO know that once Windows 2000 decides that the Plextor is only PIO
mode
capable, then nothing 'normal' will pursuade it otherwise. But if it's
a fault
on Windows side, or that the Plextor gives wrong information to
Windows about it
self, or the IDE drivers reports the wrong settings - I don't know.
I've noticed, that upgrades of the Plextor Bios and IDE drivers cause
a new scan
of hardware, and the Plextor once again becomes DMA, but once it's set
to PIO
with these drivers, then Windows remember this setting and won't let
you change
it normally.
So even downgrading the BIOS won't reset it to DMA, if Windows once
has decided
that with this BIOS it's only PIO capable, or with these drivers it's
only PIO
capable, then 'it's forever'!!
.
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