Post Graduation Diploma in Information Technology

The system unit consists of the following components:  Motherboard - MBO o a computer "backbone" responsible for communication between components and transmission of information • Central Processing Unit - CPU o functions: command execution, data transmission, computer function control o basic characteristics: • speed (in Mega Hertz (MHz), Giga Hertz (GHz)) • amount of memory (Cache in Bytes)  Random Access Memory - RAM o a memory container for programs that are currently running and data that is being processed o basic characteristics: • speed (in MHz, GHz) • capacity (in Bytes) • data rate class (DDR SDRAM, SDR SDRAM)  permanent memory: o Hard Disk Drive - HDD - device (memory) used for permanent data storage • data is stored on magnetic platters; electromagnetic heads are used for reading and recording data with the exception of the newest disk types called Solid State Drive (SSD) • basic characteristics:  disk platters rotation speed (in RPM)  capacity (in GB)  connection interface (IDE, SATA)