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XP system task uses all CPU while copying files

Posted on 2008-10-18
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Last Modified: 2013-12-01
Hi folks

I've asseblem a new (old) pc on basis of old hardware (AMD64 3500+, 1GB RAM) with a new board (ASUS A8V-VM SE). Widows installed is XP SP3. Problem: If I copy some files the system task in task manager eats up all available CPU ressources making the system incredibly slow. See attached process explorer screenschoot. Anybody a clue? My nex step is to install a Fedora dualboot to examine if its windows or the system...

In sysinternals process explorer I just see the system task taking all CPU but now, which driver or whatever is causing this.

I copy the files from an external USB disk to a local SATA disk, but its the same if I unzip a big file locally.
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Question by:SirTux
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by:SirTux
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proc explorer screenshoot
procexplorer.jpg
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by:garycase
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This is usually a sign that your disk access mode has reverted to PIO.   You can fix it by doing the following harmless registry modification (it simply forces redetection of transfer modes on the next reboot):


Load RegEdit (Start - Run - Regedit)

Go to the following keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\ Class\{4D36E96A-E325-11CE-BFC1-08002BE10318}\000x

The last four digits will be 0000, 0001, 0002, 0003, and so on.

Under each key, delete all occurences of the following values (not every key will have these values, but delete them whenever they occur):

     MasterIdDataChecksum
     SlaveIdDataChecksum

Now just reboot the system & all should be well :-)
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by:SirTux
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HI gary

No the drives are all running in UDMA mode. But the system is as slow as udner linux, i even checked that.
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by:nobus
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>>  with a new board    <<  is it the same? if not, set your device manager to display "hidden devices" and remove all - then install the drivers from :   http://support.asus.com/download/download.aspx?modelname=A8V-VM SE&SLanguage=en-us
you can also try a repair install : (needed for different hardware)
http://www.michaelstevenstech.com/XPrepairinstall.htm
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garycase earned 125 total points
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Just to be sure -- BOTH the "Transfer Mode" and "Current Transfer Mode" for ALL of the IDE channels (in Device Manager) show DMA ... right?   [It won't hurt anything to do that registry mod just to be sure.]
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by:SirTux
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many thanks, speeded up the system by (feeled) factor 2 :)
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