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Storage by Mind Map: Storage
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Storage

This is just a demo map that you can delete right away, if you feel like it...

Storage holds data, instructions, and information for future use

A storage medium is the physical material on which a computer keeps data, instructions, and information

Capacity

Capacity is the number of bytes a storage medium can hold

Storage device

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

Reading is the process of transferring items from a storage medium into memory

Writing is the process of transferring items from memory to a storage medium

Access time

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 disk

A hard disk contains one or more inflexible, circular platters that use magnetic particles to store data, instructions, and information

Hard disks can store data using longitudinal recording or perpendicular recording

Characteristics of a hard disk

The hard disk 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

Network attached storage

External hard disk

Removable hard disk

Internal and external hard disks are available in miniature sizes (miniature hard disks)

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

Flash Memory Storage

Solid state drives

Memory card

USB flash drives

ExpressCard module

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

Commonly used in notebook computers

Developed by the PCMCIA

Cloud Storage

Users subscribe to cloud storage for a variety of reasons

Cloud storage is an Internet service that provides storage to computer users

Optical Discs

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

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

Read only vs. rewritable

Optical discs 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

CD-ROM

CD-R

CD-RW

Archive disc

Picture CD

DVD-ROM

Blu-ray Disc-ROM

DVD-RW, DVD+RW, and DVD+RAM

Other Types of Storage

Tape

Magnetic stripe cards and smart cards

Microfilm and microfiche

Enterprise storage

Putting It All Together

Home user

Small Office/Home Office user

New node

Power User

Enterprise User (desktop computer)

Enterprise User (server or mainframe)

Summary

Various storage media and storage devices

Internal hard disks, external and removable hard disks, solid state drives, memory cards, USB flash drives, ExpressCard modules, cloud storage, CDs, DVDs, and Blue-ray Discs, tape, smart cards, and microfilm and microfiche