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Disk-to-disk, also called D2D, refers to copying or backing up data from one hard drive to another, as opposed to copying or backing up data to a tape drive or floppy disk, nearly outdated. The disk being copied from is known as the primary disk, while the disk being copied to is known as the secondary disk or backup disk. D2D should not be confused with the related terms virtual tape and remote backup services.
D2D differs from virtual tape in that the latter allows multiple data backup and recovery functions simultaneously, using a true file system. Remote backup services differ only in that the backed-up data are held at a remote location and the service is normally provided by a managed backup provider.
Advantages of D2D include the following: