Disk Scheduling - 2 - Operating System Questions & Answers

1.

Magnetic tape drives can write data at a speed ________ disk drives.

   A.) much lesser than
   B.) comparable to
   C.) much faster than
   D.) none of the mentioned

Answer: Option 'B'

comparable to

2.

In the ______ algorithm, the disk arm starts at one end of the disk and moves toward the other end, servicing requests till the other end of the disk. At the other end, the direction is reversed and servicing continues.

   A.) LOOK
   B.) SCAN
   C.) C-SCAN
   D.) C-LOOK

Answer: Option 'B'

SCAN

3.

Whenever a process needs I/O to or from a disk it issues a ______________

   A.) system call to the CPU
   B.) system call to the operating system
   C.) a special procedure
   D.) all of the mentioned

Answer: Option 'B'

system call to the operating system

4.

Consider a disk queue with requests for I/O to blocks on cylinders :
98 183 37 122 14 124 65 67
Considering FCFS (first cum first served) scheduling, the total number of head movements is, if the disk head is initially at 53 :

   A.) 600
   B.) 620
   C.) 630
   D.) 640

Answer: Option 'D'

640

5.

Consider a disk queue with requests for I/O to blocks on cylinders :
98 183 37 122 14 124 65 67
Considering SSTF (shortest seek time first) scheduling, the total number of head movements is, if the disk head is initially at 53 :

   A.) 224
   B.) 236
   C.) 245
   D.) 240

Answer: Option 'B'

236

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