wendyll

Yes, "vhortex" is right. The key point to recover emptied Recycle Bin files lies in whether the data contained in those files are "overwritten" or not. When you delete files the data itself isn’t deleted, just the index entry that says where the data for those files is located. The space containing the deleted files is also now marked as free space so it is available to the system for any new files to be written there instead.