Unit 2- Computer Hardware

 Identify system components  Describe the role of the central processing unit  Define computer memory  Identify types of storage devices  Care for storage media

 Box that contains components  Tower case  All-in-one

 Displays the images  LCD or LED ◦ Very thin  CRT (old) ◦ Very bulky

 My Computer PowerPoint: ◦ Take pictures of your devices or ones in a store ◦ Include brand/model

 Central Processing Unit ◦ Processor or “Brain”  Reads/interprets instructions ◦ Performs calculations to complete tasks  Speed= Gigahertz (GHz) ◦ 2.2Ghz ◦ 3GHz  1979= 8 MHz  1993= 200 MHz  2013= 3 GHz

 Random Access Memory  Active programs/data are held here ◦ Stores what you are creating ◦ “Short-term memory”  Disappears when computer is off  Measured in Gigabytes (GB) ◦ 4GB-8GB is standard now

 Circuit board  Connects all components ◦ CPU ◦ Memory ◦ Hard drive  Bus ◦ Data transfer to components

 1’s & 0’s  Use for storage size ◦ Hard drive, RAM, CD/DVD  Bit= a 1 or a 0  8 bits = 1 byte (a letter or number)  KB= 1024 bytes  MB= Million bytes  GB= Billion bytes  TB= Trillion bytes

 Start, Control Panel, System

 BIOS or ROM  Chip on motherboard  Has instructions to boot your computer ◦ Read only- no store data ◦ Tells where OS is stored (HD)  Info stays when power is off

 Power on the PC  ROM BIOS checked for location of OS ◦ Usually on the hard drive  Loads OS from hard drive into RAM  OS Starts  You log in

 What speed is a CPU measured in? ◦ GHz  Which memory holds your active, running programs or what you copied? ◦ RAM  Which type of monitor is shown? ◦ CRT

 Which memory goes away when power is off? ◦ RAM  What holds the computer’s boot instructions? ◦ BIOS ROM  What is the brains of a computer? ◦ CPU- what does it stand for?  The CPU, RAM, and ROM are all on what component? ◦ Motherboard

 Store data permanently ◦ Long-term storage  GB or TB ◦ 500GB ◦ 1TB  Inside Case  External HD ◦ USB

 Optical uses a laser to read/write data  CD or DVD-ROM= Read Only  CD or DVD-R= Record Once  CD or DVD-RW= Rewritable  CD= 80 min./ 700MB  DVD= 2 hrs./ 4.7GB  BD= 4.5 hrs. of HD/ 25GB

 Size Hard Drive: ◦ Start, Computer, right- click on C:  Type of Optical Drive: ◦ Logos on/next to drive

 No moving parts inside  SSD HD ◦ In thin laptops  Memory Cards ◦ SD, SDHC, microSD, CF, Memory Stick  USB Flash drive

8-inch 5 ¼” 3 ½” 3.5” Disk only held 1.44MB (Megabytes) Most photos are about 2MB!

 Don’t drop your HD  Avoid extreme temps for CD/DVD ◦ Like in a car  Hold optical media by edges  Keep discs in sturdy case

 In groups of 2, make a poster… ◦ Title of device ◦ Big picture of device ◦ Speed, RAM, HD ◦ 2-3 Special Features  Desktop  Laptop/Notebook  Ultrabook  Tablet  Smartphone  Game System  E-Book Reader

 T/F. Hard drives are used to temporarily store what you are creating. ◦ False  Which removable storage would you use to copy pictures from one PC to another? Flash Drive, Memory Card, Floppy, or Ext. HD ◦ Flash, Mem Card, or Ext HD  Which optical storage would be used to store music and then later erased to store photos? ◦ CD-RW

 How much data can a Blu-Ray DVD hold? ◦ 25GB  If pictures are about 3MB each, how many pictures could you put on that disc? ◦ About 8300!  Which storage device has no moveable parts? ◦ SSD/Flash

Unit 2- Computer Hardware