Logical failures occur when the hard drive devices are functional but the user or automated-OS cannot retrieve or access data stored on them. Recovery may be required due to physical damage to the storage devices or logical damage to the file system that prevents it from being mounted by the host operating system (OS). The data is most often salvaged from storage media such as internal or external hard disk drives (HDDs), solid-state drives (SSDs), USB flash drives, magnetic tapes, CDs, DVDs, RAID subsystems, and other electronic devices. In computing, data recovery is a process of retrieving deleted, inaccessible, lost, corrupted, damaged, or formatted data from secondary storage, removable media or files, when the data stored in them cannot be accessed in a usual way. ( Learn how and when to remove this template message) ( April 2016) ( Learn how and when to remove this template message) Please help rewrite this article from a descriptive, neutral point of view, and remove advice or instruction. This article is written like a manual or guidebook.
