Virtual Hard Disk (VHD)

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Used by:

• Microsoft Virtual PC
• Microsoft Virtual Server
• Microsoft Hyper-V Server

Image types

There are multiple types of Virtual Hard Disk (VHD) images:

• Fixed-size hard disk image; the image contains all data
• Dynamic-size (or sparse) hard disk image; the image contains used data only
• Differencing (or delta) hard disk image; the image contains changes relative to its parent image

Snapshots

Snapshot Differencing Disk file (AVHD)

Also see [1]

See Also

• Disk Images

External Links

• VHD (file format), by Wikipedia
• Virtual Hard Disk Image Format Specification, by Microsoft, October 2006