Skip to main content

CHAPTER 8 (Digital Storage)


CHAPTER 8 Digital Storage 




Storage
Storage is the physical material on which a computer keeps data, information, programs, and applications.

Cloud Storage 
Another storage option, in which the actual online storage media used is transparent to the user.


Access time measures : 
- The amount of time it takes a storage device to locate an item on a storage medium 
- The time required to deliver an item from memory to the processor

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

The characteristics of a hard disk include :

1)    Bezel
2)    Sealed chamber
3)    Disk platters
4)    Head arm
1)    Head actuator
2)    Drive electronics PCB
3)    Head electronics
4)    Antivibration mount
5)    Read/write head
6)    Mounting chassis

v  Head crash occurs when a read/write head touches the surface of a platter
v  External hard disk is a separate freestanding storage device that connects with a cable to a USB port or other port on a computer or mobile device

Flash Memory Storage
-       Flash memory chips are a type of solid state media and contain no moving parts 
SSD
HDD
High price(1TB≈RM1000)
Low price(1TB≈RM160-200)
Smaller capacity (max1TB lp/4TB pc)
Big capacity (max4TB lp/10TB pc)
Short lifespan
Long lifespan
Low power consumption (2W)
Higher power consumption (7W)
High speed (200-550Mb/s)
Lower speed (50-120Mb/s)


-       Memory card : A removable flash memory device that you insert and remove from a slot in a computer, mobile device, or card reader/writer
-       USB flash drives plug into a USB port on a computer or mobile device

Cloud Storage 
Cloud storage : An Internet service that provides storage to computer  or mobile device users

Optical Discs
Optical disc : consists of a flat, round, portable disc made of metal, plastic, and lacquer that is written and read by a laser
•      Optical discs commonly store items in a single track that spirals from the center of the disc to the edge of the disc
•      Track is divided into evenly sized sectors
     I.        CD-ROM : can be read from but not writable or erasable
   II.        CD-R : an optical disc on which users can write once, but not erase
  III.        CD-RW : an erasable multisession disc
 IV.        DVD-ROM : a high-capacity optical disc on which users can read but not write on or erase
  V.        DVD-R or DVD+R : competing DVD-recordable WORM formats, on which users can write once but not erase
 VI.        DVD-RW, DVD+RW, and DVD+RAM are high-capacity rewritable DVD formats

Other Types Of Storage 
1.    Magnetic stripe card : contains a magnetic stripe that stores information
2.    Smart card : stores data on an integrated circuit embedded in the card
3.    Radio Frequency Identification (RFID tag) : consists of an antenna and a memory chip that contains the information to be transmitted via radio waves
4.    Microfilm and microfiche : store microscopic images of documents on a roll or sheet film

Comments

Post a Comment

Popular posts from this blog

CHAPTER 4 - Programs And Apps

CHAPTER 4 Programs and apps Objectives overview §   Identify the general categories of programs and apps §   Describe how an operating system interacts with applications and hardware §   Differentiate among the ways you can acquire programs and apps §   Identify key features of productivity applications §   Identify the key features of graphics and multimedia applications §   Identify the uses of personal interest applications §   Identify the purpose of software used in communications §   Identify the key features of security tools §   Identify the key features of file and disk management tools Program, Software and Application PROGRAM SOFTWARE APPLICATION A set of instructions telling a computer what to do. The programs and other operating information used by a computer. Software can be made up of more than one program. All-encompassing term that is often used in contrast to hardware A program or group of programs that is desi
Post a Comment
Read more

CHAPTER 3 (Computer And Mobile Device)

Chapter 3 Computers and Mobile Device Objectives Overview §   Describe the characteristics and uses of desktops, laptops, tablets, and handheld computers. §   Describe the characteristics and types of server §   Differentiate among POS terminals, ATMs, and self-service kiosks §   Describe cloud computing and identity its uses §   Describe the characteristics and uses of smartphone, digital cameras, portable media player, and e-book readers §   Describe the characteristics of and ways to interact with game device §   Identify uses of embedded computers §   Differentiate a port from a connector, identify various ports and connectors, and differentiate among Bluetooth, Wi-Fi, and NFC wireless device connections. Types of computers include : 1.  Desktop and mobile computers 2.  Servers and terminals 3.  Smartphones, digital cameras, e-book readers and portable 4.  Game devices 5.  Embedded computers Desktops And Mobile Comput
Post a Comment
Read more

CHAPTER 6 (Inside Computers And Mobile Devices)

CHAPTER 6 INSIDE COMPUTERS AND MOBILE DEVICES Objective Overview 1)     Describe the various computer and mobile device cases and the contents they protect 2)     Describe multi-core processors the components of a processor, and the four steps in a machine cycle 3)     Explain the advantages and services of cloud computing 4)     Define a bit, and describe how a series of bits represents data 5)     Describe the purpose of adapter cards, USB adapters, and ExpressCard modules 6)     Explain the purpose of a power supply and batteries 7)     Understand how to care for computers and mobile devices Inside The Case  Desktop ·          Motherboard : The main circuit board of the computer ·          Video card ·          Sound card ·          Processor Memory module ·          Power supply and fan Laptop ·          Battery ·          Processor ·          Memory module ·          Integrated sound parts and circuity Proc
Post a Comment
Read more