43) Disk requests come to a disk driver for cylinders 10, 22, 20, 2, 40, 6 and 38, in that order at a time when the disk drive is reading from cylinder 20. The seek time is 6 ms per cylinder.If the scheduling algorithm is the closest cylinder next, then the total seek time will be

44) Disk scheduling involves deciding

45) Poor response time are caused by

46) A certain moving arm disk storage with one head has following specifications : Number of tracks I recording surface 100 Disk rotation speed 2400 rpm Track storage capacity= 62500 bits. The average latency time (assume the head can move from one track to another only by traversing the entire track) is

47) A certain moving arm disk storage with one head has following specifications : Number of tracks I recording surface 100 Disk rotation speed 2400 rpm Track storage capacity= 62500 bits. The transfer rate will be