SECONDARY STORAGE

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SECONDARY STORAGE

OTHER TYPE OF STORAGE

Microfilm and microfiche

Store microscopic images of documents on a roll or sheet film

RFID tag

Consists of an antenna and a memory chip that contains the information to be transmitted via radio waves

Smart card

Stores data on an integrated circuit embedded in the card

Magnetic stripe card

Contains a magnetic stripe that stores information

CLOUD STORAGE

Makes it easy to upload and share files with anyone

Cloud storage is an Internet service that provides storage to computer or mobile device users

Apple

Amazon

Microsoft

Google

Dropbox

SOLID-STATE

Types of flash memory storage

USB flash drives

Plug into a USB port on a computer or mobile device

Portable

Connect to USB port

Memory cards

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

Widely used in laptops, smartphones, GPS navigation systems

Solid-state drives (SSD)

Contains its own processor to manage its storage

Access to slash memory or solid state storage

Faster and more durable than hard disks

Data and information are stored and retrieved electronically

Memory contains no moving parts

IMPORTANT CHARACTERISTIC OF SECONDARY STORAGE

Access speed

measures amount of time required by the storage to retrieve data & programs

Storage devices

hardware that reads data & programs from storage media

Capacity

how much a particular storage medium can hold

physical material that holds data & programs

Media

ENTERPRISE STORAGE

Tape

Magnetically coated ribbon of plastic capable of storing large amounts of data and information

Storage area network (SAN)

High-speed network with the sole purpose of providing storage to other attached servers

Network attached storage (NAS)

Share through internet

Network attached storage

server that is placed on a network with the sole purpose of providing storage to users, computers, and devices attached to the network

Duplicates data, instructions, and information to improve data reliability

Enterprise hardware allows large organizations to manage and store data and information using devices intended for heavy use, maximum efficiency, and maximum availability

OPTICAL DISK

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

High-capacity rewritable DVD formats

DVD-R or DVD+R

Competing DVD-recordable WORM formats, on which users can write once but not erase

DVD-ROM

High-capacity optical disc on which users can read but not write on or erase

Use reflected light to represent data

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

MAGNETIC STORAGE

THREE ways to improve performance of hard disk

File compression/ decompression

RAID

Disk caching

External hard disk

Easily removed

Slower access

Internal hard disk

Cannot be easily removed from the system unit

Connected to a USB or Thunderbolt port

Fast access

Located inside the system unit

Hard disk rigid metallic platters

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

WHAT IS SECODARY STORAGE

Items on a storage medium remain intact even when you turn off a computer or mobile device

Provide permanent or nonvolatile storage

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