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Storage by Mind Map: Storage
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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 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

New node


Read/Write Heads

New node

Sectors and Tracks

Revolutions per Minute

Transfer Rate

Access Time

The hard disk 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 (redundant array of independent disks) is a group of two or more integrated hard disk

Network attached storage

A network attached storage (NAS) device is a server connected to a network with the sole purpose of providing storage

External hard disk

An external hard disk is a separate free-standing hard disk that connects to your computer with a cable or wirelessly

Removable hard disk

A removable hard disk is a hard disk that you insert and remove from a drive

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

Solid state drives (SSDs) have several advantages over magnetic hard disks, Faster access time, Faster transfer rates, Generate less heat and consume less power, Last longer

Memory card

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, CompactFlash (CF), Secure Digital (SD), Secure Digital High Capacity (SDHC), microSD, microSDHC, xD Picture Card, Memory Stick, Memory Stick Micro (M2)

USB flash drives

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

ExpressCard module

An ExpressCard module is a removable device that fits in an ExpressCard slot

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

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

New node

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


A CD-ROM can be read from but not written to Read from a CD-ROM drive or CD-ROM player


A CD-R is a multisession optical disc on which users can write, but not erase


A CD-RW is an erasable multisession disc Must have a CD-RW drive

Archive disc

Stores photos from an online photo center

Resolution usually is 7200 pixels per photo

Cost is determined by the number of photos being stored

Picture CD

Single-session CD-ROM that stores digital versions of film

Typically uses a 1024 x 1536 resolution

Many photo centers offer Picture CD services


A DVD-ROM is a high-capacity optical disc on which users can read but not write or erase Requires a DVD-ROM drive

Blu-ray Disc-ROM

A Blu-ray Disc-ROM (BD-ROM) has a storage capacity of 100 GB


DVD-RW, DVD+RW, and DVD+RAM are high-capacity rewritable DVD formats

Other Types of Storage


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

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

Magnetic stripe cards and smart cards

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

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

Enterprise storage

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

Putting It All Together

Home user

320 GB hard disk

Cloud storage

Optical disc drive

Card reader/writer

USB flash drive

Small Office/Home Office user

1 TB hard disk

Cloud storage

Optical disc drive

External hard disk for backup

USB flash drive

New node

250 GB hard disk

Cloud storage

Optical disc drive

Portable hard disk for backup

Card reader/writer

USB flash drive

Power User

2.5 TB hard disk

Cloud storage

Optical disc drive

Portable hard disk for backup

USB flash drive

Enterprise User (desktop computer)

1 TB hard disk

Optical disc drive

Smart card reader

Tape drive

USB flash drive

Enterprise User (server or mainframe)

Network storage server

40 TB hard disk system

Optical disc server

Microfilm or microfiche


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