Just to add my 5 cents to this topic: I had similar READ_DMA_TIMEOUT
problems with a Promise Ultra100 controller with 2 PATA disks that
caused various problems including memory corruption under heavy use. As
soon as I replaced the controller with a cheap VIA 6421 controller all
problems went away. One strange thing was that when only 1 PATA disk is
attached there are no (obvious) problems. The problems start to appear
only when more disks are attached to the controller.
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