Data Recovery Glossary


It is the short form of "Hard Disk Drive", a HDD helps to manage the transfer of data to and from your computer's Hard Disk. Because these two items always come as a single unit and "Hard Disk" are usually used to refer to the same thing.

Bad Device

This is the storage device that contains the data you want to recover. A Bad Device can be any disk-like storage media, such as your computer's Hard Disk, an external HDD, Flash card or any other form of removable media.

Good Device

This is a storage device that is in perfect working order onto which you want M3 Data Recovery to save the data recovered from the Bad Device. The Good Device may be located on the computer where you've installed M3 Data Recovery (the "host" computer). The Good Device can be any of the storage media listed for the Bad Device. The Good Device is used to save recovered data from the Bad Device.


It is the short form of "File Allocation Table", a FAT is a table stored on your storage device that tells the computer where to look over when it needs to find a file stored on this device. When you save data, it is stored in chunks of information called "clusters". The clusters for a single file may actually be located in several different areas on your storage media. The FAT is the way for your computer to record the locations of those clusters for each file you save. The term FAT is often used to refer to the file systems which use File Allocation Tables - FAT12, FAT16, and FAT32.


A partition is a logical division of a Hard Disk that creates the impression that you have more than one Hard Disk. If you want to run two different Operating Systems on the same Hard Disk, you should create a two-partition drive when you format the disk. Partitioning a disk is just a way to divide it into independent sections.

Dynamic Disk

A Dynamic disk is a physical disk that provides features the basic disks do not have, such as support for volumes spanning multiple disks. Dynamic disks use a hidden database to track information about dynamic volumes on the disk and other dynamic disks in the computer. Dynamic disk management is a data/Hard Disk management method on Microsoft Windows platforms, first introduced with Windows 2000 Operating System. The basic concept was put to use on UNIX platforms years earlier. There are five types of Dynamic volumes: Simple Volume, Striped Volume, Spanned Volume, Mirrored Volume, and RAID-5 Volume.


It is the short form of "The Second/Third Extended File System", and it is used in Linux/UNIX Operating System. It carries out the semantic file and supports the advance extended characteristics in Linux/UNIX Operating System.


Compressed files are those documents compressed by Windows under NTFS partition. By means of compressed files, folders or procedures can decrease their sizes and occupied spaces in the drivers or removable memory devices. And compressing the driver can decrease the spaces of files or folders on it.

Encrypted files are those documents encrypted by Encrypting File System of Windows. The Encrypting File System (EFS) provides the core file encryption technology for storing encrypted files on NTFS volumes. EFS keeps files safe and stops intruders who might gain unauthorized physical access to sensitive, stored data (for example, by stealing a portable computer or external disk drive).

But before the lost data is retrieved, we must to pay attention to something to avoid further loss of data. In that way we can use data recovery software to recover the data efficiently.

If data has been lost, please stop all operations to your computer to avoid some possible disk written. Because a lot of temporary files will be generated by these operations, and the lost data may be written by these temporary files.

Please don't write data to the partition where you want to recover lost data.

After data loss, we strongly recommend you download M3 Data Recovery to recover your lost data.