ASSIGNMENT 12
Textbook Assignment: “Magnetic Disk Storage”, chapter 10, pages 10-21 through 10-33; and
“CD-ROM Storage”, chapter 11, pages 11-1 through 11-7.
12-1.
12-2.
12-3.
12-4.
The velocity transducer in a disk memory set
drive unit helps control the acceleration and
deceleration of which of the following parts?
1. The drive motor
2. The spindle assembly
3. The carriage assembly
4. The operating frequency of the system clock
The polarity and amplitude of the voltage
induced into the velocity transducer coil by the
transducer core indicate which of the following
movement characteristics?
1. The speed the disk is rotating
2. The speed of the carriage assembly only
3. The direction of travel of the carriage
assembly only
4. The speed and direction of the carriage
assembly movement
The servo circuit used to position the read/write
heads in a disk memory set is centered on the
right track when the error voltage is equal to
1. -1 volt
2. 0 volts
3. +1 volt
4. +5 volts
The feedback signal in the velocity transducer
servo circuit performs which of the following
functions?
1. It is used to move the carriage faster
2. It tells the servo circuit when the desired
location is reached
3. It opposes the position error and dampens
carriage movement
4. It moves the heads by one track
12-5.
12-6.
12-7.
12-8.
If a disk has an error on its servo surface, it is
possible to rewrite the servo surface.
1. True
2. False
The number of sectors per track that will be
written on a disk memory set disk pack is
selectable by what means, if any?
1.
2.
3.
4.
The sector select switch only
A set sector size command from the computer
only
Either the sector select switch or a set sector
size command from the computer; the result is
the same
None; the number of sectors per track is fixed
When a disk pack is formatted, the locations of
the tracks are controlled by which of the
following factors?
1.
2.
3.
4.
The prerecorded tracks on the servo disk
surface
The smallest increment the actuator assembly
can move the heads
An operator controlled entry of number of
tracks
A computer command designating number of
tracks per inch
When a magnetic disk set is operating normally,
what is the relationship, if any, between the
position of the heads and the disk’s surface?
1.
2.
3.
4.
The heads physically contact the disk
The heads are held above the disk surface by
the head arm springs
The heads float above the surface of the disk
on a cushion of air
None; the position of the heads does not affect
disk operation
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