Unit 2

Unit 2

1. Hardware

   • The physical components of a computer system
   • Permanent storrage
     • Computers require a lot of space to save things, and the small memory in the CPU is not enough to sustain the computer
     • Primary storage/Secondary storage
       • HDD
         • A stacked set of magnetic plates which spin at approximately 10,000 revs per minute
           • Advantages
             • 1.Large Capacity. 2.Faster Than Optical Disks. 3.Persistent Storage. 4.Easaly replaced and upgraded
           • Disadvanteges
             • 1.Relies On Moving Parts. 2.Disk Surfaces Can Be Damaged. 3.Heavy Power Consumption. 4.Noisy
       • SSD
         • Use microchips to store the data, it has no moving parts.
           • Advanteges
             • 1.Fast Read/Write Access. 2.Silent Operation. 3.Low Power consumption
           • Disadvanteges
             • 1.Small Capacity. 2.Very Expensive. 3.Limited Life
       • Cloud Storage
         • Uploading file to the internet so they can be accessed anywhere with internet access.
   • RAM
     • Random Access Memory
       • Volatile i.e. is deleted whenever system is turned off
   • ROM
     • Read Only Memory
       • Stores data even when system is turned off.
   • CPU
     • ALU
       • Arithmetic and Logic Unit
     • PC
       • Program Counter
     • C
       • Cache
     • B
       • Buses
     • CU
       • Control Unit