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"Hardware Interrupts" hogging CPU


A_T

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Recently I used ImgBurn 2.1.0.0 and noticed that my CPU was dominated by "Hardware Interrupts" (as reported by Proccess Explorer) so that the burn would not exceed 2x and no other application could be used. After some investigation I found theat the IDE channel was set to PIO mode (I always have DMA enabled). The only way I could get DMA mode back was to uninstall the driver for that channel and restart Windows XP - then all was well. Today I fired up ImgBurn and again "Hardware Interrupts" swamped the CPU - sure enough PIO was enabled.

 

Something is changing the transfer mode on the IDE channel to PIO. Any ideas what is doing this?

 

Infotool results attached

InfoTool.txt

Edited by A_T
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It happens when you get a lot of read errors (or just errors in general) when working with the drive. Windows automatically steps down the speed until it finds one that works ok, or until it hits the lowest possible - PIO.

 

If you look in eventlog you might see some 'cdrom' entries where it complains about errors.

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