Please enable JavaScript.
Coggle requires JavaScript to display documents.
SECONDARY STORAGE :star: :new_moon: (Hard Disk Pengertianā¦
SECONDARY STORAGE
:star: :new_moon:
Hard Disk
Performance Enhancement
Disk Caching
Provide temporary high speed holding area between secondary storage and CPU
Reduce time to access data
File Compression and Decompression
Files are compressed before it stored and decompressed before being used again
RAID
Redundant Array of Inexpensive Disks
Improving access speed
Providing realiable storage
Use for group of storage
How does data destroyed?
HEAD CRASH
It occurs when a read-write head makes contact with the hard disk's surface or with particles on its surface.
How does it store files?
Hard Disks save files by altering the magnetic charges of the disk's surface to represent binary, 1s and 0s.
Hard Disk retrieve the data and programs by reading the charges from the magnetic disks. [(+) and (-)]
What are the types of Hard Disk?
Internal Hard Disks
Located inside the system unit
Able to store and retrieve large quantities of information quickly.
Cons
Have fixed amount of storage
Cannot be easily removed from the system unit
Fast Access
Used to store programs and data files
External Hard Disks
Cons
Provide slower access
Also have fixed amount of storage
Useful to protect and secure sensitive information
Can be serve as backup from the contents of Internal Hard Disk
Serves additional hard-disk capacity
Can be easily removed
Providing multiple access to unlimited amount of storage
Solid State Drives
(SSDs)
Connected inside a PC system same way as hard disk
Cons
More expensive
Have a lower capacity
Pros
SSD are more faster and durable
SSD requires less power
device that uses integrated circuit assemblies as memory to store data persistently
Mass Storage Devices
file servers
Network attached storage
RAID system
organization cloud storage
Optical Disc
Compact Disk (CD)
Non-Volatile
can hold up to about 80 minutes of uncompressed audio or about 700 MiB of data
originally developed to store and play only sound recordings
DVD
medium can store any kind of digital data
widely used for software and other computer files as well as video programs watched using DVD players
DVDs offer higher storage capacity than compact discs while having the same dimensions
Blu-ray
capable of storing several hours of video in high-definition and ultra high-definition resolution
as a medium for video material such as feature films and for the physical distribution of video games for the PlayStation 3, PlayStation 4, and Xbox One
allows information to be stored at a greater density than is possible with the longer-wavelength red laser used for DVDs
CLOUD STORAGE
Cloud Server
Application provided as a services rather than product
Supply by server
Example
Dropbox
-www.dropbox.com
Google
-drive.google.com
Microsoft
-www.skydrive.com
Amazon
-amazon.com/cloud
Apple
-www.icloud.com
Disadvantages
Access speed
File security
Advantages
Maintenance
Hardware upgrade
File sharing and collaboration
