Many new motherboards usually have one PATA connection. More for legacy PATA CD/DVDs.
with pictures:
http://en.wikipedia.org/wiki/Parallel_ATA
http://en.wikipedia.org/wiki/Serial_ATA
http://en.wikipedia.org/wiki/Parallel_ATA#IDE_and_ATA-1
I converted to SATA only with my 'new' build in 2006. Samsumg just came out with a SATA DVD that was only $10 extra, the week I went shopping for parts. Sony was the only one before with a SATA DVD and it 50% more that PATA.
I used to have so much trouble with PATA connections coming loose when I mucked around in case that I really wanted something better.
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