My computer WIN7 system, recently found that the optical drive icon is gone, the device manager inside the optical drive option is not there, please ask what happened ah!

The ATA chanel 0/1, double-click to open, see if there is an ATA device is an optical drive. If there is no optical drive may not be connected. If there may be a bad CD-ROM drive. You can connect the CD-ROM drive to another computer and try to see if it's good. Optical drive power supply, data cable to plug yourself again.