A system and method is disclosed for creating and exposing virtual disk images to a host server, during a KVM session, using an HTML5 KVM/virtual media client running in a Chrome™ Web browser of a user's device (e.g., PC workstation). The host server is able to select all or specific portions of the virtual disk image for use, whereupon the bytes representing the selected data content are packaged by the HTML5 KVM/virtual media client using a persistent sandbox and transmitted to the host server. Using the HTML5 KVM/virtual media client to create and expose virtual disk images from the persistent sandbox of the Chrome™ Web Browser eliminates the problem of the Web browser not being able to directly access physical media (e.g., disks) on the user's device, and further significantly reduces data size limitations on the size of the virtual disk images that may be created.