Question

difference between device driver and application software​

Answer 1

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➡Nothing - they both come under the heading of “System Software”. System Software is a broad term that can roughly be thought of as ‘anything that isn’t application software’. Operating Systems, Device drivers, Data Base Management systems all are considered ‘system software’, their function is to provide the tools that application software uses to access the various functions of a modern computer. An application doesn’t have to include all the code that develops the disk address of a record, or actually issue instructions to move the HDD’s read/write head to the correct position on the platter and detect when the proper sector of the platter is ready to receive the data, then to verify that the data was properly written and return an error if it wasn’t, that’s all done by the OS, the HDD driver, and possibly the Data Base Management system. All the application code needs to do is issue a call to an API to tell the system software where the data is in memory, how many bytes to write, and how to store it so it can be retrieved later, then it just checks the return value from the system software to make sure things went well. That sounds like a lot of information to pass, but it can be a few as 12 to 16 bytes of data.

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Answer 2

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A software engineer generally thinks that good software is a result of implementing proven patterns, staying within rules, using discipline, and follow