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Storage by Mind Map: Storage
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Capacity is the number of bytes a storage medium can hold

device is the computer hardware that record and/or retrieves items to and from storage media

Access time measures

Hard Disks

contains one more inflexible

can store data using longitudinal recording or perpendicular recording

Characteristics of a hard disk include:

Formatting is the process of dividing the disk into tracks and sectors

arms move the read/write head, which reads items and writes items in the drive

A head crash occurs when a read/write head touches the surface of a platter

Always keep a backup of your hard disk

RAID is a group of two or more integrated hard disks

A disk controllers consists of a special-purpose chip and electronic circuits that control the transfer of data, instructions, and information from a disks to and from the system bus and other components of the computer

Flash Memory Storage

Flash memory chips are a type of solid state media and contain no moving parts

Solid state drives ( SSDs) have several advantages over magnetic hard disks:

A memory card is a removable flash memory device that you insert and remove from a slot in a computer, mobile device, or card reader/writer

USB flash drives plug into a USB port on a computer or mobile device

An Express Card module is a removable device that fits in an Express Card slot

Developed by the PCMCIA

Commonly used in notebook computers

Video: Thumb Drive ( USB Flash Drive Encryption)

Cloud Storage

is an internet service that provides storage to computer users

Users subscribe to cloud storage for a variety of reasons:

Optical Discs

An optical disc consists of a flat, round, portable disc made of matal, plastic, and lacquer that is written and read by a laser

Typically store software, data, digital photos, movies, and music

Read only vs. rewritable

commonly store items in a single track that spirals from the center of the disc to the edge

Track is divided into evenly sized sectors

Care of optical discs

Other Types of Storage

Tape is a magnetically coated ribbon of plastic of storing large amounts of data and information

A tape drive reads and writes data and information on a tape

A magnetic stripe card contains a magnetic stripe that stores information

A smart card stores data on a thin microprocessor embedded in the card

Microfilm and microfiche store microscopic images of documents on a roll or sheet film

Enterprise storage stores huge volumes of data and information for large businesses