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Try and find an updated BIOS for your motherboard from the manufacture. The 300GB drive is likely not fully supported but can be fixed by newer code. If you have an open IDE channel move the 300GB drive there, by sharing the primary channel with the 40GB drive you are slowing the 300GB to the 40GB specs. If you don't have an open channel you should transfer all your data and ditch the 40GB.
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