C# Constants:

const string GUID_DEVINTERFACE_DISK = "53f56307-b6bf-11d0-94f2-00a0c91efb8b";

VB Constants:

Const GUID_DEVINTERFACE_DISK As String = "53f56307-b6bf-11d0-94f2-00a0c91efb8b"

Notes:

Guid DiskGUID = new Guid(GUID_DEVINTERFACE_DISK);