Discuss one example where an interrupt occurs at the beginning of an event. Describe a circumstance in which the interrupt occurs at the completion of an event. What is the difference between these types of events (300 words with reference).
Efficient use of I/O is important for multimedia such as video and sound. Assume that the blocks of a movie are stored consecutively on a DVD-ROM. Describe the steps used to retrieve the blocks for use by the movie display software application. Discuss ways in which you could optimize the performance of the I/O transfer (300 words with reference).