Why does the hard drive and the CD drive get together Error

Q: I installed a couple of hard drives a few days ago I loaded two hard drives onto an IDE line, and the hard drive was not recognized. Later, the main disk and CD-ROM installed together, found the hard drive and optical drive, but there has been "chassis intrusion Warning", what should I do?

A: Chassis intrusion warning means: your cover is open. Remove this information simply by covering it, or by clicking on the motherboard instructions to block the function. As for the two hard drive installed on the same IDE connector line is completely OK, your problem may be the hard drive of the master-slave way set wrong. Each IDE interface can have two IDE devices installed, but one must be a primary connection, one is connected from the other way, or it will not work properly.