Consider a disk drive with following specifications. 16 surfaces, 128tracks/surface, 256 sectors/track, 512B/sector, rotations speed to 3600rpm. The disk is operated in cycle stealing mode whereby whenever one byte word is ready it is sent to memory. similarly for writing, the disk interface reads a 5 Byte word from the memory in each DMA cycle. Memory cycle time is 50 micro seconds. The maximum percentage of time CPU is blocked in DMA operation is _________?
