Calculate how much disk space (in sectors, tracks, and surfaces) will be required to store 300,000 120-byte logical records if the disk is fixed sector with 512 bytes/sector, with 96 sectors/track, 110 tracks per surface, and 8 usable surfaces. Ignore any file header record(s) and track indexes, and assume that records cannot span two sectors. ***Background information for next

 Calculate how much disk space (in sectors, tracks, and surfaces) will be required to store 300,000 120-byte logical records if the disk is fixed sector with 512 bytes/sector, with 96 sectors/track, 110 tracks per surface, and 8 usable surfaces. Ignore any file header record(s) and track indexes, and assume that records cannot span two sectors. ***Background information for next question that I need help with.

Consider the disk system described above, and assume the disk rotates at 360 rpm. A processor reads one sector from the disk using DMA, with one interrupt per sector. If it takes 2.5 μs to process each interrupt, what percentage of the time will the processor spend handling I/O? (disregard seek time)