An ISO is a sector-by-sector copy of an optical disc (CD, DVD, Blu-ray). It contains:
Converting a VHD to an ISO is a legitimate task, but it is rarely the best tool for the job. convert vhd to iso
A VHD is a hard drive image, and an ISO is an optical disc image. A hard drive image contains a Master Boot Record (MBR) or GUID Partition Table (GPT) and a filesystem designed for random read/write access. An optical disc image contains a filesystem designed for optical media (like ISO 9660 or UDF) and is designed for read-only access. An ISO is a sector-by-sector copy of an