The IDE DVD and the SATA hard drive can be installed together in the desktop computer, BUT not on the same data cable, they have different types of data cables and disk controllers. You need an IDE disk controller and a SATA disk controller, the late model motherboards have both types of controllers on the motherboard.
If the motherboard has both types of disk controllers then check the BIOS setting and make sure the SATA controller is enabled. If the motherboard has both types of disk controllers then check the BIOS setting and make sure the SATA controller is enabled.
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The IDE DVD and the SATA hard drive can be installed together in the desktop computer, BUT not on the same data cable, they have different types of data cables and disk controllers.
You need an IDE disk controller and a SATA disk controller, the late model motherboards have both types of controllers on the motherboard.
If the motherboard has both types of disk controllers then check the BIOS setting and make sure the SATA controller is enabled.