12-16.
12-17.
12-18.
12-19.
In a magnetic disk system, reducing the
flying height of the heads has which of the
following advantages?
1.
2.
3.
4.
Requires a stronger current to accurately
write on the disk
Reduces the signal to noise ratio,
increasing the accuracy of the disk
Increases the signal to noise ratio,
increasing the accuracy of the disk
Increases the physical space on the disk
required to store data
The U-shaped groove in the bottom of a thin
film head is used for what function?
1. To regulate the air pressure and control
the flying height of the head
2. To direct the magnetic field from the head
onto the disk when writing
3. To channel the magnetic field from the
disk to the head when reading
4. To hold the erase head
The mechanical system that moves the heads
across the disk surface is known as the
1. head drive system
2. head arm
3. head actuator
4. disk drive motor
A motor that moves in precise detents when
a drive signal is applied is known as a
1. voice coil motor
2. stepper motor
3. servo motor
4. synchro
12-20.
1.2-21.
12-22.
12-23.
Which of the following actuators could suffer
a loss of data because of variations in
temperature?
1. Voice coil
2. Stepper motor
3. Servo motor
4. Synchro
For proper positioning of the heads, which of
the following actuators requires a dedicated
servo surface or servo signal embedded in the
sector gaps?
1. Voice coil
2. Stepper motor
3. Servo motor
4. Synchro
The speed of the spindle motor in a fixed disk
is controlled by which of the following
devices?
1. An optical sensor
2. A tachometer only
3. A feedback loop only
4. A tachometer and feedback loop
Timing and synchronization between a fixed
disk drive and the drive controller are
accomplished by which of the following
means?
1. A clock on the controller
2. A clock on the disk drive logic board
3. Special timing signals on the disk
4. Data and flux reversal pulses
12-24. Which of the following data encoding
methods is NOT used with fixed disk drives?
1.
2.
3.
4.
100
Modified frequency modulation
Frequency modulation
Run length limited
Non-return-to-zero indiscrete
