Q7 Security

Movable-head magnetic disks, such as the computer hard drive, have ____ read/write head(s).

0124

The RAID level ____ uses word parity for error correction.

1356

Without DMA, the ____ is responsible for the physical movement of data between main memory and the device.

CPU

____ devices are assigned to only one job at a time.

Dedicated

The number of characters that can be recorded per inch on a magnetic tape is determined by the ____ of the tape.

Density

____ control the transfer of information between the disk drives and the rest of the computer system.

Disk drive Interfaces

Most RAID configurations require fewer disk drives, which decreases hardware costs.

False

RAID is a set of logical disk drives that is viewed as a single physical unit by the operating system.

False

RAID-0 is ideal for data-critical real-time systems.

False

The SCAN algorithm moves the arm methodically from the inner to the outer track, servicing every request in its path.

False

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.

False

To put data on an optical disc requires a high-intensity laser beam, which burns indentations, called pits, and flat areas, called ____.

Lands

The advent of optical discs was made possible by developments in ____ technology.

Laser

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.

Megabytes

In indexed storage, when a file is created, the pointers in the index block are all set to ____.

Null

On an optical disc, all sectors are ____.

Of the same size throughout the disc

____ is a way to optimize search times by ordering the requests once the read/write heads have been positioned.

Rotational Ordering

____ uses the same underlying philosophy as shortest job next, where the shortest jobs are processed first and longer jobs are made to wait.

SSTF

In a fixed-head magnetic disk, each circle is called a ____.

Track

Additional complex configurations of RAID can be created by combining multiple levels.

True

Directories are special files with listings of filenames and their attributes.

True

First-come, first-served (FCFS) is the simplest device-scheduling algorithm.

True

RAID Level 0 is the only one that does not provide error correction, or redundancy, and so it is not considered a true form of RAID because it cannot recover from hardware failure.

True

The File Manager is in charge of the system's physical components, its information resources, and the policies used to store and distribute the files.

True

The universal serial bus (USB) controller acts as an interface between the operating system, device drivers, and applications and the devices that are attached via the USB host.

True