Attempt 1
1.
First-come, first-served (FCFS) is the simplest device-scheduling algorithm.
A) True
B) False
| Points Earned: | 1.0/1.0 | |
| Correct Answer(s): | True | |
2.
Movable-head magnetic disks, such as the computer hard drive, have ____ read/write head(s).
A) zero
B) one
C) two
D) four
| Points Earned: | 1.0/1.0 | |
| Correct Answer(s): | B | |
3.
The advantage of RAID Level 3 is that if any one drive fails, data can be restored using the bits in the parity disk.
A) True
B) False
| Points Earned: | 0.0/1.0 | |
| Correct Answer(s): | False | |
4.
The job of the I/O control unit is to keep up with the I/O requests from the CPU and pass them down the line to the appropriate control unit.
A) True
B) False
| Points Earned: | 1.0/1.0 | |
| Correct Answer(s): | False | |
5.
RAID-0 is ideal for data-critical real-time systems.
A) True
B) False
| Points Earned: | 1.0/1.0 | |
| Correct Answer(s): | False | |
6.
An optical disc drive adjusts the speed of the disc’s spin to compensate for the sector’s location on the disc—this is called continuous linkage velocity (CLV).
A) True
B) False
| Points Earned: | 1.0/1.0 | |
| Correct Answer(s): | False | |
7.
The SCAN algorithm moves the arm methodically from the inner to the outer track, servicing every request in its path.
A) True
B) False
| Points Earned: | 1.0/1.0 | |
| Correct Answer(s): | False | |
8.
The data-transfer rate for an optical disc is measured in ____ per second and refers to the speed at which massive amounts of data can be read from the disc.
A) kilobytes
B) megabytes
C) gigabytes
D) terabytes
| Points Earned: | 1.0/1.0 | |
| Correct Answer(s): | B | |
9.
If the transport speed for a magnetic tape is 200 inches per second and the density is 1600 bpi, a total of ____ bytes can be transferred in one second.
A) 3,200
B) 32,000
C) 320,000
D) 3,200,000
| Points Earned: | 0.0/1.0 | |
| Correct Answer(s): | C | |
10.
Additional complex configurations of RAID can be created by combining multiple levels.
A) True
B) False
| Points Earned: | 1.0/1.0 | |
| Correct Answer(s): | True | |
11.
____ is a way to optimize search times by ordering the requests once the read/write heads have been positioned.
A) Rotational ordering
B) SSTF
C) C-SCAN
D) LOOK and SCAN
| Points Earned: | 0.0/1.0 | |
| Correct Answer(s): | A | |
12.
Two of the most important measures of optical disc drive performance are sustained data-transfer rate and longest access time.
A) True
B) False
| Points Earned: | 1.0/1.0 | |
| Correct Answer(s): | False | |
Attempt 2
1.
Additional complex configurations of RAID can be created by combining multiple levels.
A) True
B) False
| Points Earned: | 1.0/1.0 | |
| Correct Answer(s): | True | |
2.
____ uses the same underlying philosophy as shortest job next, where the shortest jobs are processed first and longer jobs are made to wait.
A) LOOK
B) FCFS
C) SSTF
D) SCAN
| Points Earned: | 1.0/1.0 | |
| Correct Answer(s): | C | |
3.
The SCAN algorithm moves the arm methodically from the inner to the outer track, servicing every request in its path.
A) True
B) False
| Points Earned: | 1.0/1.0 | |
| Correct Answer(s): | False | |
4.
A DVD with a fast data transfer rate will drop fewer frames when playing back a recorded video segment than will a unit with a slower transfer rate.
A) True
B) False
| Points Earned: | 0.0/1.0 | |
| Correct Answer(s): | True | |
5.
The traffic controller maintains a database containing the status and connections for each unit in the I/O subsystem, grouped into Channel Control Blocks, Control Unit Control Blocks, and Device Control Blocks.
A) True
B) False
| Points Earned: | 1.0/1.0 | |
| Correct Answer(s): | True | |
6.
A fixed-head disk is lower in cost than a movable head disk.
A) True
B) False
| Points Earned: | 1.0/1.0 | |
| Correct Answer(s): | False | |
7.
Direct access storage devices (DASDs) are devices that can directly read or write to a specific place on a disk.
A) True
B) False
| Points Earned: | 1.0/1.0 | |
| Correct Answer(s): | True | |
8.
Two of the most important measures of optical disc drive performance are sustained data-transfer rate and longest access time.
A) True
B) False
| Points Earned: | 1.0/1.0 | |
| Correct Answer(s): | False | |
9.
Among the many differences between an optical disc and a magnetic disk is the design of the disc track and sectors.
A) True
B) False
| Points Earned: | 1.0/1.0 | |
| Correct Answer(s): | True | |
10.
When using DMA, the CPU is involved in transferring data to and from memory for the entire transfer.
A) True
B) False
| Points Earned: | 1.0/1.0 | |
| Correct Answer(s): | False | |
11.
To put data on an optical disc requires a high-intensity laser beam, which burns indentations, called pits, and flat areas, called ____.
A) lands
B) valleys
C) hills
D) lakes
| Points Earned: | 1.0/1.0 | |
| Correct Answer(s): | A | |
12.
Data recorded on fixed-head DASDs may or may not be blocked at the discretion of the ____.
A) end user
B) application programmer
C) operator
D) database administrator
| Points Earned: | 0.0/1.0 | |
| Correct Answer(s): | B | |
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