Quiz 17.2

DIRECTIONS: Read each question carefully. Then click on the dot next to the answer that most closely fits the question. Try to answer all questions on this quiz and when you are done, click on the grade me button at the bottom.

Coverage: Sections 17.3 to 17.5

  1. Which of the following bit patterns is a Manchester encoding of the binary string 1101?
11011101
10100110
01011001
11110011

  1. Why might a long sequence of 1's cause problems when transmitted data between components?
a single bit error could cause the whole sequence to get misinterpreted
drift might occur if the two clocks are not perfectly synchronized
one component might think the other one has experienced an error in its electronics

  1. In main memory a byte address is how data is located. How is data located in a disk drive?
by sector address
also by byte address
by track address

  1. Which component interprets high level disk drive commands coming from the computer and issues low level signals to the peripheral's motors and electronics?
the arbiter
the controller
the sequencer

  1. What do we call the software in the operating system that translates high level I/O commands to controller commands?
device driver
dynamic link library
microprogram

  1. What is angular speed of a spinning object?
the speed it would have if it weren't traveling at an angle
translational velocity
rate of rotation

  1. Which time component of a disk drive operation is due to the slowness of the stepper motor?
seek time
rotational delay
data transfer time

  1. Which time component of a disk drive operation is often the longest?
seek time
rotational delay
data transfer time

  1. Where is the bit density greatest on a disk drive?
near the outer edge
near the center
it is constant everywhere

  1. As of 1997, what is the upper limit on speeds of disk drives?
3000 rpm
7000 rpm
10,000 rpm

  1. As of 1997, what is the data transfer rate of the fastest Seagate disk drive? (MB/s = Megabytes per second)
1 MB/s
11 MB/s
100 MB/s