Can I install an IDE (PATA) hard disk in my PC if the only IDE connector is used by the DVD drive?
Yes, you can set up the PATA hard disk as either a master or slave and the DVD drive as the other of the two choices. Use one of the methods given in the previous answer above to do this. If there is only one IDE connector, and the DVD drive is at present the only device connected to it that means that your hard disk is a SATA drive. There are probably at least two SATA connectors on the motherboard and you can attach the PATA drive to one of them by using an IDE Drive to SATA Cable Converter.