In virtualization, what does the .VHD file extension stand for?

In virtualization, what does the .VHD file extension stand for?

• Virtual High Density
• Video Hard Drive
• Virtual Hard Disk
• Virtual Hazard Detection 

EXPLANATION

VHD is the file extension for a disk image file format for storing the complete contents of a hard drive. VHD stands for virtual hard disk. The disk image, sometimes called a virtual machine, replicates an existing hard drive and includes all data and structural elements.

VHDX is a Hyper-V virtual hard disk (VHD) format found in Windows Server 2012. The main advantage of switching to VHDX is its increased storage capacity of 64 TB (terabytes), instead of VHD's standard storage limit of 2 TB.