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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

The amount of time it takes a storage device to locate an item on a storage medium

The time required to deliver an item from memory to the processor

Hard Disks

contains one more inflexible

circular platters that use magnetic particles to store data


New ninformationode

can store data using longitudinal recording or perpendicular recording

Characteristics of a hard disk include:



Read/write Heads


Sectors and Tracks

Revolution per Minute

Access Time

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

Location often is referred to by its cylinder

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

Secure Digital (SD)

Secure Digital High Capacity SDHC

micro SD


xD Picture Card

Memory Stick

Memory Stick Micro (M2)

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:

Access files from any computer

Store large files instantaneously

Allow others to access their files

View time-critical data and images immediately

Store offsite backups

Provide data center function

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

Uses special hardware for heavy use, maximum availability, and maximum efficiency