SECONDARY STORAGE
WHAT IS SECODARY STORAGE
Provide permanent or nonvolatile storage
Items on a storage medium remain intact even when you turn off a computer or mobile device
MAGNETIC STORAGE
Hard disk contains one or more inflexible, circular platters that use magnetic particles to store data, instructions and information
Hard disk rigid metallic platters
Internal hard disk
Located inside the system unit
Fast access
Connected to a USB or Thunderbolt port
Cannot be easily removed from the system unit
External hard disk
Slower access
Easily removed
THREE ways to improve performance of hard disk
Disk caching
RAID
File compression/
decompression
OPTICAL DISK
An optical disc consists of a flat, round, portable disc made of metal, plastic, and lacquer that is written and read by a laser
Use reflected light to represent data
DVD-ROM
High-capacity optical disc on which users can read but not write on or erase
DVD-R or DVD+R
Competing DVD-recordable WORM formats, on which users can write once but not erase
DVD-RW, DVD+RW, and DVD+RAM
High-capacity rewritable DVD formats
ENTERPRISE STORAGE
Enterprise hardware allows large organizations to manage and store data and information using devices intended for heavy use, maximum efficiency, and maximum availability
RAID
Duplicates data, instructions, and information to improve data reliability
Network attached storage (NAS)
server that is placed on a network with the sole purpose of providing storage to users, computers, and devices attached to the network
Network attached storage
Share through internet
Storage area network (SAN)
High-speed network with the sole purpose of providing storage to other attached servers
Tape
Magnetically coated ribbon of plastic capable of storing large amounts of data and information
IMPORTANT CHARACTERISTIC OF SECONDARY STORAGE
Media
physical material that holds data & programs
Capacity
how much a particular storage medium can hold
Storage devices
hardware that reads data & programs from storage media
Access speed
measures amount of time required by the storage to retrieve data & programs
SOLID-STATE
Memory contains no moving parts
Data and information are stored and retrieved electronically
Types of flash memory storage
Solid-state drives (SSD)
Faster and more durable than hard disks
Access to slash memory or solid state storage
Contains its own processor to manage its storage
Memory cards
Widely used in laptops, smartphones, GPS navigation systems
Removable flash memory device that you insert and remove from a slot in a computer, mobile device, or card reader/writer
USB flash drives
Connect to USB port
Portable
Plug into a USB port on a computer or mobile device
CLOUD STORAGE
Cloud storage is an Internet service that provides storage to computer or mobile device users
Dropbox
Microsoft
Amazon
Apple
Makes it easy to upload and share files with anyone
OTHER TYPE OF STORAGE
Magnetic stripe card
Contains a magnetic stripe that stores information
Smart card
Stores data on an integrated circuit embedded in the card
RFID tag
Consists of an antenna and a memory chip that contains the information to be transmitted via radio waves
Microfilm and microfiche
Store microscopic images of documents on a roll or sheet film