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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