.avhd — Microsoft Azure Virtual Hard Disk
Microsoft · 2008
AVHD files are virtual hard disk images used by Microsoft's Hyper-V for creating and managing virtual machines.
Key Features
- Stores a full disk image including OS and data.
- Supports fixed and dynamic disk types.
- Integrates directly with Hyper-V and other Microsoft virtualization products.
- Allows for snapshots and differencing disks for backup and testing.
Best For
- Users of Microsoft Hyper-V.
- Creating isolated development and testing environments.
- Migrating physical machines to virtual machines (P2V).
- Storing complete operating system images.
Less Ideal For
- General file storage and sharing.
- Archiving non-system related data.
- Use with non-Microsoft virtualization platforms (though conversion is possible).
- Situations requiring broad compatibility without conversion.
Common Use Cases
- Creating virtual machines for software testing.
- Deploying standardized application environments.
- Running multiple operating systems on a single physical machine.
- Backing up and restoring entire system states.
How to Open It
- Mount the AVHD file directly within Hyper-V Manager by attaching it to a virtual machine's storage controller.
- Use Microsoft Virtual Machine Converter (MVMC) to convert AVHD to other formats like VHDX or VMDK.
- Utilize third-party virtualization software like VMware Workstation or VirtualBox, which often support importing or converting AVHD files.
What is a .avhd file?
An AVHD file is a virtual hard disk image format primarily used by Microsoft's Hyper-V virtualization platform. It stores the complete contents of a hard drive, including the operating system, applications, and user data, as a single file. This allows for the creation of isolated virtual environments for testing software, running different operating systems, or deploying applications. AVHD files can be attached to virtual machines and function as if they were a physical hard drive.
Programs That Open .avhd Files
| Platform | Program | ||
|---|---|---|---|
| Windows | Hyper-V Manager | Free | Official |
| Microsoft Virtual Machine Converter | Free | Official | |
| macOS | VMware Fusion | Paid | |
| Parallels Desktop | Paid | ||
| Linux | KVM/QEMU | Free | |
| VirtualBox | Free |
How to Convert .avhd Files
| Format | Method |
|---|---|
| .VHDX | Hyper-V Manager, Microsoft Virtual Machine Converter |
| .VMDK | Microsoft Virtual Machine Converter, VMware vCenter Converter |
Common Problems with .avhd Files
Frequently Asked Questions
AVHD is essentially a differencing disk format derived from a parent VHD file, used for snapshotting in older Hyper-V versions. VHD is the base virtual hard disk format.
Not directly without conversion or specialized virtualization software that supports the format, such as VirtualBox or VMware.
The AVHD file itself is not inherently compressed, although dynamic disks will only occupy space as data is written, up to the maximum defined size.
Technical Details
AVHD is a proprietary binary format that contains a sector-by-sector representation of a hard disk. It supports both fixed and dynamic disk types, with dynamic disks growing as needed up to a defined maximum size. The format itself doesn't inherently include compression or encryption, relying on the host system or virtualization software for those features.