: The flat file contains strictly raw data; it has no headers or metadata. All configuration details (like disk geometry or hardware version) are stored separately in the descriptor file . The Descriptor vs. Flat File Relationship
Never try to rename a -flat.vmdk file directly. If you do, the descriptor file (the small .vmdk ) will no longer point to the correct filename, and your VM will fail to power on with an error like "The parent virtual disk has been modified." vmware flat file