The paper describes the speech research material and notes on Data Recovery. Data recovery is necessary when source material fails and where no backup exists, either Physical or Logical. There are two types of data recovery in the standard basic sense. One type of data recovery is when there is damage to the media and the pre-existing data need to be retrieved. The second is when files were purposely or accidentally deleted. When this type of data recovery is necessary there is usually no damage to the media and standard software can be used to recover the data.