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I'm looking through ATA/ATAPI-6 Annex (A.) and there's a chart for 40-wire cabling indicating various minimum and maximum length restrictions in table A.4, along with the statement "Cable capacitance shall not exceed 35pf." The chart is not particularly clear as to the allowable limits for a single device cable. Even more troubling is the lack of any explanation electrically for establishing the minimum length wiring allowed. There is somewhat more information in the 80-wire tables, but there's no justification given for the minimum host-to-device distance of 5 inches. Since there are plenty of good reasons to build things with shorter cables, what are the specific parameters to be accounted for in establishing the minimum length? I know the limitations of going longer have been argued and covered reasonably well. -- --------------------- I make stuff go. --------------------- Larry Barras Apple Computer Inc. 1 Infinite Loop MS: 306-2TC Cupertino, CA 95014 (408) 974-3220
