CEA Chapter 6
D
A _________ is a high-definition video disk that can store 25 Gbytes on a single layer on a single side. a. DVD b. DVD-R c. DVD-RW d. Blu-ray DVD
A
A __________ disk is permanently mounted in the disk drive, such as the hard disk in a personal computer. a. nonremovable b. movable-head c. double sided d. removable
True
A bit near the center of a rotating disk travels past a fixed point slower than a bit on the outside. a. True b. False
True
A removable disk can be removed and replaced with another disk. a. True b. False
B
Adjacent tracks are separated by _________. a. sectors b. gaps c. pits d. heads
False
Because data are striped in very small strips, RAID 3 cannot achieve very high data transfer rates. a. True b. False
C
Data are transferred to and from the disk in __________. a. tracks b. gaps c. sectors d. pits
False
SSD performance has a tendency to speed up as the device is used. a. True b. False
A
Scanning information at the same rate by rotating the disk at a fixed speed is known as the _________. a. constant angular velocity b. magnetoresistive c. rotational delay d. constant linear velocity
True
The SSDs now on the market use a type of semiconductor memory referred to as flash memory. a. True b. False
A
The areas between pits are called _________. a. lands b. sectors c. cylinders d. strips
B
The disadvantage of _________ is that the amount of data that can be stored on the long outer tracks is only the same as what can be stored on the short inner tracks. a. SSD b. CAV c. ROM d. CLV
False
The disadvantage of using CAV is that individual blocks of data can only be directly addressed by track and sector. a. True b. False
True
The head must generate or sense an electromagnetic field of sufficient magnitude to write and read properly. a. True b. False
D
The set of all the tracks in the same relative position on the platter is referred to as a _________. a. floppy disk b. single-sided disk c. sector d. cylinder
A
The sum of the seek time and the rotational delay equals the _________, which is the time it takes to get into position to read or write. a. access time b. gap time c. transfer time d. constant angular velocity
False
The transfer time to or from the disk does not depend on the rotation speed of the disk. a. True b. False
False
The width of a track is double that of the head. a. True b. False
True
There are typically hundreds of sectors per track and they may be either fixed or variable lengths. a. True b. False
False
During a read or write operation, the head rotates while the platter beneath it stays stationary. a. True b. False
True
Flash memory becomes unusable after a certain number of writes. a. True b. False
C
Greater ability to withstand shock and damage, improvement in the uniformity of the magnet film surface to increase disk reliability, and a significant reduction in overall surface defects to help reduce read-write errors, are all benefits of ___________. a. magnetic read and write mechanisms b. platters c. the glass substrate d. a solid state drive
D
In most contemporary systems fixed-length sectors are used, with _________ bytes being the nearly universal sector size. a. 64 b. 128 c. 256 d. 512
True
Magnetic disks are the foundation of external memory on virtually all computer systems. a. True b. False
True
RAID is a set of physical disk drives viewed by the operating system as a single logical drive. a. True b. False
True
RAID level 0 is not a true member of the RAID family because it does not include redundancy to improve performance. a. True b. False
B
RAID level ________ has the highest disk overhead of all RAID types. a. 0 b. 1 c. 3 d. 5
C
When the magnetizable coating is applied to both sides of the platter the disk is then referred to as _________. a. multiple sided b. substrate c. double sided d. all of the above
C
________ is when the disk rotates more slowly for accesses near the outer edge than for those near the center. a. Constant angular velocity (CAV) b. Magnetoresistive c. Constant linear velocity (CLV) d. Seek time
A
__________ is the standardized scheme for multiple-disk database design. a. RAID b. CAV c. CLV d. SSD