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in Lesson 2 Introduction to Real Time Embedded Systems Part II by
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Hard drives have two kinds of components: internal and external. External components are located on a printed circuit board called logic board while internal components are located in a sealed chamber called HDA or Hard Drive Assembly. The big circuit is the controller. It is in charge of everything: exchanging data between the hard drive and the computer, controlling the motors on the hard drive, commanding the heads to read or write data, etc. All these tasks are carried out as demanded by the processor sitting on the motherboard. It can be verified to be single-functioned, tightly constrained, Therefore one can say that a Hard Disk Drive is an RTES. 

Version 2 EE IIT, Kharagpur 

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