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Pin 20 on an IDE cable is the 'key' pin. ie it doesn't exist. So ideally there should be no pin, and no hole on the connector.
Of course it's not always cheapest to do it that way, so you may see connectors with 40 holes. You shouldn't see drives with 40 pins though (as a lot of connectors wouldn't work with them).
Any use?
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I can't understand why people are frightened of new ideas. I'm frightened of the old ones. -- John Cage (1912 - 1992)
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