Consider a RAID level 5 organization comprising five disks, with  the parity for sets of four blocks on four disks stored on the fifth disk. How many blocks  are accessed in order to perform the following? a. A write of one block of data b. A write of seven continuous blocks of data

Suppose we have a magnetic disk with the following parameters: Average seek time = 12 ms Rotation rate = 7200 RPM Transfer rate = 48 MB/second Sector size = 512 bytes What is the average time to read a single sector?

It is the job of the operating system to arrange the blocks in the correct sequence when a file is written to disk. When discussing magnetic disks, why is this step absolutely necessary? Would it make any difference if solid-state drives (SSDs) were utilized instead, or is it moot either way? So, what gives?

Consider a system with three I/O devices: a printer, a disk, and a communications line, with increasing priorities of 2, 4, and 5, respectively.. A user program begins at t = 0. At t = 5, a printer interrupt occurs;  at t = 15, a communications interrupt occurs. While this routine is executing, a disk interrupt occurs (t = 20). Printer Interrupt service takes 10 time slots. Communication Interrupt Service takes 10 time slots. Disk Interrupt Service takes 8 time slots.   When will the control return to the user program? Show the changes in the following diagram