The terms dynamic, expandable, and sparse are often used interchangeably when referring to dynamically expandable virtual disks.

The backing store is represented by a VHD image file. The term backing store is used to refer to the physical file that exists on the actual hard disk. These APIs allow for generic use of virtual disks independent of any other virtualization technologies. It is not necessary to install separate applications or implement a VHD format parser to enable these operations. The Microsoft Windows Software Development Kit (SDK) integrates Native VHD support for working with virtual disks, making it easier for developers and administrators to create, manage, and deploy Windows images in VHD files using either the platform API support or management tools. These products use the VHD API to contain the Windows operating system image utilized by a virtual machine as its system boot disk. Virtual disks created with the VHD API can function as boot disks.Īn example of how VHD files are used is the Hyper-V feature in Windows 7, Windows Server 2008, Virtual Server, and Windows Virtual PC. VHD API support allows management of the virtual disks. These virtual disks are capable of hosting native file systems (NTFS, FAT, exFAT, and UDFS) while supporting standard disk and file operations.

The Virtual Hard Disk (VHD) format is a publicly-available image format specification that allows encapsulation of the hard disk into an individual file for use by the operating system as a virtual disk in all the same ways physical hard disks are used.

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