Hmmm... Okay... And you have the master/slave configuration okay, where the jumper is on one drive? I have not seen this type of failure before.

Try disconnecting the slave drive and run only with the 12GB master. I am wondering if there are other problems on your mainboard, or if the drives do not want to coexist.
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Paul Grzelak
200GB with 48MB RAM, Illuminated Buttons and Digital Outputs