Microsoft thought for the introduction of the many new and exciting options with every refashion of Windows OS it launches. With Windows seven, Windows 8, Windows 8.1, Windows 10, (and Windows Server 2008), it introduced a superb means that of the backup and storing the necessary data and files within the variety of Virtual disk that created a straight away backup of files while not the use of any external disk. Maintaining a backup of files on the basics of capturing the image of files and storing it in a virtual form instead of using another physical machine is done by the help of a Virtual Machine. In another word, Virtually storing of the data or files and keeping its image file with you.

A Virtual Machine or Virtual Disk is a software that emulates the functionality of a physical hard disk by creating images of data stored in it. For the different device, a virtual disk appearance behaves like an actual physical device. The benefits of those virtual onerous disks air, host machine will co-exist with many in operation systems, several window partitions are done, no want for extra hardware because the virtual disc is accessed inside the host system, simply detached from the host machine.

There are different types of file formats supported by different virtual machines as VHD, VHDX, VMDK and VDI. The difference is that all the format are developed by the different company and every format has different storage capacity for storing the data within them. Everyone always gets confused by file format supported by their virtual machine or why they are different.
Virtual hard disk (VHD) is file format extension that represents a virtual hard disc. It usually pretends to be a hard disk of a virtual machine. The format was thought by Connectix referred to as Microsoft Virtual laptop since Connectrix was taken by Microsoft in 2003. Virtual hard disk permits multiple operation systems to run on one host machine. There's the power to directly modify a virtual machine's hard disk from a bunch server supports several applications, as well as moving files between a VHD and also the host classification system, Patching, Image Management, Anti-virus, Recovery, and Backup. The creation of VHD file simply depends upon its use. If you want to create a VHD file for your virtual machine, you can use the disk management by creating a new .vhd file by using the available disk space on the computer and then save it to the location that you specify. Or if you want to take system backup, you can use Backup and Restore tool.

Hyper-V Hard disk (VHDX)
 is file format extension that describes the Virtual file format. The X was else to the present specification in order that there's no confusion with the older VHD format. One amongst the largest examples of VHDX, when put next with VHD Format, is that the storage capabilityBefore Windows Server 2012, Virtual arduous disks had a pair of TB limit, however, currently VHDX files have a sixty-four TB capability. the benefits of VHDX are not restricted to improved capability however conjointly VHDX files were designed to figure with today's trendy hardware. The VHDX format conjointly provides protection against file corruption associated with power failures by unendingly keeping track of updates on the information, a feature not on the market with the VHD format. However, VHDX file is often utilized by Windows 8+ and Windows Server 2012+, owing to terrible giant file format it cannot be utilized by Windows visual percept.
Virtual Machine Disk(VMDK)
 is a file format extension that acts as containers for the virtual hard disk specified for VMware digital computer or VirtualBox. It stores the content of VMware virtual machine. VMDK is file format specification employed by VMware virtual machine files. One amongst its main examples is that using this file format, files are simply moved between the server. The maximum VMDK size is generally 2TB for most applications, but in September 2013, VMware vSphere 5.5 introduced 62TB VMDK capacity. Because it is now an open format VMDK is now supported by VirtualBox (part of the Oracle VM suite), Parallels Desktop Version 10, Sun xVM etc.

Virtual Disk Image(VDI)
 file format extension associated with the specification for VirtualBox that stores data in files like .vdi. used by Oracle VM VirtualBox, an open-source desktop virtualization program can be mounted as a hard disk on Mac, Windows, and Unix platforms, allows users to run programs written for different operating systems in a high-speed virtual environment. This technique to form an image of a virtual machine’s disk to be later used for disk backup, restoration or repeating to a new virtual machine. The VDI captures all info on the first disk, usually excluding the software system files and therefore the virtual machine itself. 


Virtualization could be applied to applications, servers, storage, and networks and is that the single handiest thanks to cut back IT expenses whereas boosting potency and lightsomeness for all size businesses. The Advantages of those virtual arduous disks square measure, host machine will co-exist with many operative systems, several window partitions are often done, no want for extra hardware because the virtual disk is accessed by the host system, simply detached from the host machine. Even one thing as straightly by disk partitioning as a result of you're taking one drive and partition it to form 2 separate hard drives.