Q20) (Input / Output) The sequential read operation in hard disks involve two operations: Moving the disk head to the physical location where the data is residing (seek time), and reading the associated blocks continuously (read time). However, while reading the blocks, the data needs to be read in addition to some procesing time (due to error correction etc.). Since the disk continues to move during this time, the next block in sequence slips off the disk head. In order to solve this problem, disk interleving between the sequential sectors is usually employed. Below you can find the characteristics of a Hard disk (these are made-up numbers for the sake of this question).

Q20) (Input / Output) The sequential read operation in hard disks involve two operations: Moving the disk head to the physical location where the data is residing (seek time), and reading the associated blocks continuously (read time). However, while reading the blocks, the data needs to be read in addition to some procesing time (due to error correction etc.). Since the disk continues to move during this time, the next block in sequence slips off the disk head. In order to solve this problem, disk interleving between the sequential sectors is usually employed. Below you can find the characteristics of a Hard disk (these are made-up numbers for the sake of this question). Table - Hard Disk Characteristics. Figure - Illustration of a Hard Disk. 15 16 17 18 19 20 21 2425 26/27 Number of Cylinders 13 14 15 16 17 18 Direction of disk rotation 20 19 22 Sectors per cylinder 64 12 18 19 20 21 22 23 24 26 128 Bytes per sector 512 21 22 Seek time (adjacent cylinders) 0.9 msec Sector Disk Speed 182 7200 RPM Time to transfer a sector 1.4 msec Processing time for a sector 0.2 msec 6 Track/Cylinder In order for this hard disk to be capable of proper sequential read operations, how much interleaving is required?