Arithmetic Logic Unit (ALU), Carries out the LOGICAL, SHIFT and Arithmetic operations., Control Unit (CU), Coordinates activities taking place in the CPU. , Memory Address Register (MAR) , Holds the address of the instruction or data that needs to be fetched or stored. , Memory Data Register (MDR), Holds data or program instruction temporarily when it is fetched or before it is stored in the memory, Program Counter (PC), Holds address of the next instruction to be processed, Accumulator (ACC), Temporarily holds results of operations carried out in the ALU , Clock Speed , Pulse rate measured in hertz used to synchronise the activities taking place in the CPU. , Cache Memory, Volatile memory that holds most frequently used instructions., Cores, Multiple processors within one CPU that can independently carry out multiple instructions simultaneously, Embedded System, Purpose built computational device designed to perform a specific function., Random Access Memory (RAM), Volatile Main Memory that holds currently used instructions , Virtual Memory (VM), Partitioned section of secondary storage that acts as main memory., Read Only Memory (ROM), Non-volatile memory that holds the bootstrap loader., Primary Storage, RAM, ROM and Cache memory., Secondary Storage, HDD, SSD, Optical Drive, Magnetic Hard Drive (HDD), Non-Volatile Secondary storage that contains moveable parts., Solid State Drive (SSD), Non-Volatile Secondary storage that uses flash memory chips., Optical Device, A compact disc (CD) that relies on an reader to be accessed by the computer., Cost, the price of storage per GB., Speed, How quickly data can be read from or written to a storage device., Capacity, Amount of storage space available on a storage device, Portability, The ease with which a storage device can be unplugged and moved., Durability, How well a storage device can resist damage., Reliablity, The longevity of a storage device..

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