In a distributed System, it consist collection of independent computers (each with respective operating systems) that appears to be a single coherent system in the user’s view. Distributed OS looks to user like ordinary centralized OS, but runs on multiple, independent CPUs (through networking). File replication in this kind of system is possible and any updates should be reflected on the replicas (since it is distributed) trough different schemes. The memory in this system has a wider span, thus it has wider resource and definitely employs vast amount of memory. Centralized system on the other hand is a type of system on which communication within the system is routed into a single machine. Data replication maybe possible in a centralized system, but whenever changes are made in a single file, it automatically reflects to its replica (since it is centralized). The system memory is in contrary with the previous one because its resource is limited and may have greater computing power. Both systems employ security measures but differ on implementation. Also in a distributed system, components will still function if one fails, while on the centralized system it is in divergent.
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