Windows XP pro. Windows 7 Pro. Virtual Disk Z [3GB capacity] was created on both Windows XP Pro. and Windows 7 Pro. Four folders containing many files were stored on Virtual Disk Z. The next day, the Virtual Disk Z became a clone of partition C with the full storing capacity as partition C and all the folders and files on partition C. The folders and files I stored on Virtual Disk Z on the day before disappeared. Nowhere could I find any trace of them. This happened on both Windows XP Pro. and Windows 7 Pro. where Virtual Disks had been created. Is this intended to be this way or something wrong? Any idea where I can find the disappeared folders? How to prevent this from happening again in the future? Thank you!