A VCD file is a disk image of a DVD or CD. The VCD files can be recognized by the typical virtual CD ROM softwares and the operating systems understand these files as actual CD or DVD. Whereas the software is picking the data from hard disk. VCD files are copies of actual CDs and DVDs to be used without requiring physical drives and is beneficial for mounting discs on network computers.
VCD file format
A VCD file format is categorized as a disk image file format that creates the disk image with extension .vcd; used to access the content of a CD or DVD without the need for a physical CD-ROM or a DVD-ROM drive. The VCD files are integrated with compression of disk image and format specifications used for archiving various types of files and even the entire content of an optical disk and hard drive into one virtual CD file; can be mounted by using a virtual drive software to access the data stored in the VCD file. Hence, VCD file format creates images of your own optical media, so you can use them at any time without having the physical medium on hand. Availability of your data will be maximum, while lost, damaged and stolen are not concerns of a VCD file. The entire structure or specifications of this file format are not publicly available.