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 8 2