pata and ide are the same. you should get an ide your system looks old.
this is how sata looks: http://upload.wikimedia.org/wikipedia/commons/2/29/SATA_ports.jpg
this is how pata/ide looks: http://upload.wikimedia.org/wikipedia/commons/2/29/ATA_on_mainboard.jpg
http://upload.wikimedia.org/wikipedia/commons/c/c4/Ata_20070127_002.jpg
look at your motherboard. find out which cable goes to dvd drive. and buy that type of drive.