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Storage by Mind Map: Storage
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What is??

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

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

Hard Disk Drive , External HDD , USB , Memory Card , Disket , Compact Disc (CD) , Digital Video Disk (DVD) , Blu-ray Disk , Etc.


is the number of bytes a storage medium can hold

1 TB (Terabyte) = 1,000,000,000,000 Byte

1 GB (Gigabyte) = 1,000,000,000 Byte

1MB (Megabyte) = 1,000,000 Byte

1 KB (Kilobyte) = 1,000 Byte

1 Byte = 8 Bits

Hard Disk Drive (HDD)

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

RAID (redundant array of independent disks) : is a group of two or more integrated hard disks A network attached storage (NAS) device is a server connected to a network with the sole purpose of providing storage

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 SATA , EIDE , SCSI , SAS

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: Faster access time , Faster transfer rates , Generate less heat and consume less power , Last longer

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)



xD Picture Card

Memory Stick

Memory Stick Micro (M2)

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

Cloud storage

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

Face Book , MySpace , Youtube , Gmail , Window Live Hotmail , Window Live SkyDrive

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 functions

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‐RWis 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

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

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 flim

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

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

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


250 GB hard disk

Cloud storage

Optical disc drive

Card reader/writer

Portable hard disk for backup

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