How could it exploit information to improve performance

1. Some systems automatically open a file when it is referenced for the first time and close the file when the job terminates. Discuss the advantages and disadvantages of this scheme compared with the more traditional one, where the user has to open and close the file explicitly.

2. If the operating system knew that a certain application was going to access file data in a sequential manner, how could it exploit this information to improve performance?

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