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The following types of VHD formats are supported by Microsoft Virtual PC and Virtual Server: VHDs are implemented as files that reside on the native host file system. VHDX was added in Hyper-V in Windows Server 2012 to add larger storage capacity, data corruption protection, and optimizations to prevent performance degradation on large-sector physical disks.

Life-cycle management and provisioning (re).

Disk conversion (physical to virtual, and vice versa).

Moving files between a VHD and the host file system.

The ability to directly modify a virtual machine's hard disk from a host server supports many applications, including: This method enables developers to test software on different operating systems without the cost or hassle of installing a second hard disk or partitioning a single hard disk into multiple volumes. Features Ī Virtual Hard Disk allows multiple operating systems to reside on a single host machine. Since June 2005, Microsoft has made the VHD and VHDX Image Format Specifications available to third parties under the Microsoft Open Specification Promise.

VHDX was introduced in Windows 8/Windows Server 2012 to add features and flexibility missing in VHD that had become apparent over time. The format was created by Connectix for their Virtual PC product, known as Microsoft Virtual PC since Microsoft acquired Connectix in 2003. They are typically used as the hard disk of a virtual machine, are built into modern versions of Windows, and are the native file format for Microsoft's hypervisor ( virtual machine system), Hyper-V.

They may contain what is found on a physical HDD, such as disk partitions and a file system, which in turn can contain files and folders. VHD ( Virtual Hard Disk) and its successor VHDX are file formats representing a virtual hard disk drive (HDD).