This is the VHD tool’s usage description:
VhdTool.exe /create <FileName> <Size> [/quiet]
VhdTool.exe /convert <FileName> [/quiet]
VhdTool.exe /extend <FileName> <NewSize> [/quiet]Create: Creates a new fixed format VHD of size <Size>.
Convert: Converts an existing file to a fixed-format VHD.
The existing file length, rounded up, will contain block data
A VHD footer is appended to the current end of file.Extend: Extends an existing fixed format VHD to a larger size <Size>.
VHD tool
Source : 4sysops
