CCD files exist as 2 different types. Please find information about each of them below.
Type 1: CloneCD Control File
A CloneCD Control File has the .ccd extension. It is used by CloneCD to store disc image data. The .ccd file contains control data. An image file (usually .img) also needs to be present. The two files...
A CloneCD Control File has the .ccd extension. It is used by CloneCD to store disc image data. The .ccd file contains control data. An image file (usually .img) also needs to be present. The two files together make up a CD/DVD image that can be mounted or burned. The .ccd file may come with a .sub file containing subchannel data.
Virtual CloneDrive can directly use .ccd files. Third party virtual drives like Daemon Tools and Alcohol 120% can also mount .ccd images. The Linux application ccd2iso converts CCD/IMG files to an ISO image.
CCD files contain control and header data for a corresponding .IMG file. The .IMG file contains the actual disc image. CCD and IMG files with the same names need to be combined to create a usable disk image. CloneCD saves disk images across the .ccd control file, .img data file, and optionally a .sub subchannel file.
The .ccd format stores properties of a CD/DVD image. To burn a CD/DVD the .ccd file needs an image file. It can be mounted directly by disc emulators or Virtual CloneDrive. Third-party virtual drives can also mount it. CCDISO converts CCD files to ISO images. CUE, BIN and other formats have a structure similar to .ccd.