Disaster recovery (DR) the policies, process and procedures that are related to preparing for recovery or continuation of technology infrastructure which are vital to an organization after a natural or human-induced disaster.

The examination of each step in a disaster recovery program. DR testing helps in recovering data, restore business critical applications, and continue operations after an interruption of services. 

A method of momentarily powering-down, or muting, a mobile or portable wireless telephone set when there is no voice input to the set. This optimizes the overall efficiency of a wireless voice communications system.

A mechanism for improving the time it takes to read from or write to a hard disk. A disk cache can also be a specified portion of the RAM. It holds data that has recently been read,  and adjacent data areas that are likely to be accessed next. 

Disk Cleanup is a computer maintenance utility included in Microsoft Windows designed to free up disk space on a computer's hard drive. The utility first searches and analyzes the hard drive for files that are no longer of any use, and then removes the unnecessary files.

The act of copying the contents of a computer's hard drive. The contents are typically saved as a disk image file and transferred to a storage medium, which could be another computer's hard drive or removable media such as a DVD or a USB drive.

A variation of disk mirroring in which each of multiple storage disks has its own SCSI controller. It uses redundant controllers that enables continued data access as long as one of the controllers continues to function.

A copy of the entire contents of a storage device, such as a hard drive, DVD, or CD. The disk image represents the content exactly as it is on the original storage device, including both data and structure information. 

Disk Management is a system utility for managing hard disks and the volumes or partitions that they contain. With Disk Management, you can initialize disks, create volumes, and format volumes with the FAT, FAT32, or NTFS file systems. Disk Management enables you to perform most disk-related tasks without restarting the system or interrupting users. Most configuration changes take effect immediately.

The replication of data to two or more disks. Disk mirroring is a good choice for applications that require high performance and high availability such as transactional applications, email, and operating systems.

The first widely-installed operating system for personal computers. DOS was (and still is) a non-graphical line-oriented command- or menu-driven operating system, with a relatively simple interface but not overly "friendly" user interface. 

Disk Partitioning is an act of dividing the hard disk storage space into separte logical data areas often called as partitions. One can use a partition editor program to create, modify and delete a partition. Partitioning allows machines to improve disk efficiency. The FAT system used by operating systems automatically allocates the cluster size based on the disk size.

The process of dividing a body of data into blocks and spreading the data blocks across several partitions on several hard disks. Each stripe is the size of the smallest partition.

An approach to hybrid cloud backup that involves using local storage for staging data that will eventually be sent to a third-party cloud storage service provider. The backup is stored on local disk first so it can be captured at high speed. 

An approach to computer storage backup and archiving in which data is initially copied to backup storage on a disk storage system and then periodically copied again to a tape storage system.

A random access, removable data storage medium that can be used with personal computers. The term usually refers to the magnetic medium housed in a rigid plastic cartridge measuring 3.5 inches square and about 2millimeters thick.