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Digital Storage : Preserving content Locally and on the cloud (Optical…
Digital Storage : Preserving content Locally and on the cloud
Storage
storage medium
physical material on whicha computer keeps data , information, programs and application
cloud storage
keeps information on serves on the internet and the actual media on which the files are stored are transparent to the user
types of storage
USB flash derive
memory cards
cloud storage
optical disk
features of storage
storage device
hadrware- records and/or retrieves items to and from storage media
capacity
number of bytes a storage medium can hold
An ilustration of volality/ volatile
screen display
contents disaappear when power is removed
most RAM
its contents are erased when power is removed from computer/mobile devices
nonvolatile
contents of storage
its content remain when power is off
access time measures
the amount of time it takes a storage device to locate an item on a storage medium
the time require to deliver an item from memory to the processor
Hard drives /hard disk
contains one or more inflexible, circular platters that use magnetic particles to store data,instuctions and information
in personal computer- enclosed inside an airtight,sealed case
Laptop hard disk is much smaller than the desktop hard disk.
Storage capacity determined by
number of plattera the hard disk contains
the composition of the magnetic coating on the platters
whether the disk uses longitudinal or perpendicular recording
density
Formatting - process of the dividing the disk into tracks and sectors
Characteristic
tracks
sectors
platters
form factor
read/write head
revolutions per minute
Portable Flash Memory Storage
memory card
removable flash memory storage device
USB flash drives
plug into a USB port on a computer or mobile device
cloud storage
Internet service that provides storage to computer or mobile device user.
Optical Disk
CD-ROM
can be read but not written to
CD-R
can write once but not erase
CD-RW
an erasable multisession disc
DVD-ROM
user can read but not write on or erase
DVD-R / DVD+R
write once, but not erase
DVD-RW,DVD+RW and DVD+RAM
user can write on multiple times
Enterprise Storage
enterprise hardware allows large organization to manage and tore data and information
Network attached storage (NAS)
server placed on network, provide storage to users, computer and devices attached to network
Storage area network (SAN)
high-speed network, provide storage to other attached server
Tape
magnetically coated ribbon of plastic, store large amount of data and information
tape drive reads and writes data and information on magnetic tape
Other types of Storage
magnetip stripe card
contain information
smart card
stores data on an integrated circuit embedded in the card
RFID tag
consists antenna and memory chip that contain information to be transmitted via radio waves
NFC-enabled device
contain chip that stoe informations to be transmitted, self-adhesive
RFID reader
read radio signal and transfer informtion to the computer or computing devices