A parallel ATA cable has 40 wires. Some high performance cables have 80, but there are only 40 distinct wires - with every other wire being grounded to minimize cross-talk.
A parallel ATA connector can use one data cable for two drives.
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Parallel ata cable connecter have 40 pins.
The 80-conductor cable and the 40-conductor cable.
Parallel ATA connectors use a 40 pin female connector with one pin removed for keying.
series is newer in ata like series ata and ata the old one is parallel ata
ATA/33 has 40 wires. Where as the ATA/66 has 80 wires. Physically they look the same. The extra wires are for grounding.
80 conductor IDE cable; 40 conductor IDE cable
Under parallel ata, two types of ribbon cable are used. The 80-conductor ide cable has 40 pins and 80 wires Forty wires are used for communication and data, and an additional 40 ground wires reduce crosstalk on the cable. An older 40-conducror cable has 40 wires and 40 pins. the two types of cables are PATA and IDE cables which come in a 80-conductor IDE cable and a 40-conductor cable
"The thinner serial-ATA cable does not hinder airflow within the case" info from Jean Andrews CompTIA A+ Guide to Hardware Fourth Edition
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Serial ATA are thin cables that don't hinder airflow inside a case as much as the wide parallel ATA cables do.