ITS-235 Quiz 7

dedicated

A device that can be assigned to only one job at a time, such as a monitor or mouse, and serves that job for the entire time the job is active is called a(n)_______________ device.

track

A path on a storage medium along which data is recorded best describes a(n)_____________ .

Interrupt

A(n) __________ refers to a hardware signal that suspends execution of a program and activates the execution of a special program known as the interrupt handler.

Hamming

An error-detecting and error-correcting code that greatly improves the reliability of data, named after mathematician Richard Hamming best describes _______________ code.

False (this is called constant angular velocity (CAV).)

An optical disc drive spins at a constant speed—this is called constant linear velocity (CLV). True / False

Virtual

As a peripheral device, a(n) ____________ device is a combination of a dedicated device and a shared device.

False

Device management principles are changing rapidly to accommodate cloud computing. True / False

True

Direct access storage devices (DASDs) are devices that can directly read or write to an arbitrary place on a disk. True / False

True

First-come, first-served (FCFS) is the simplest device-scheduling algorithm; it is easy to program and essentially fair to users. True / False

Transfer

For a sequential access storage media such as magnetic tape, the ________rate is equal to the density of the tape multiplied by the tape drive speed.

transfer

For a sequential access storage media such as magnetic tape, the ________rate is equal to the density of the tape multiplied by the tape drive speed.

pits

On a DVD in contrast to lands, ______________ are tiny depressions on the reflective layer.

False (RAID begins with the assumption that several small-capacity disk drives are preferable to a few large-capacity disk drives.)

RAID begins with the assumption that a small set of large-capacity disk drives is preferable to a larger set of small-capacity disk drives. True / False

False (RAID consists of a set of physical disk drives that is viewed as a single logical unit by the operating system; look at pg. 240 for the seven primary levels of RAID)

RAID is a set of logical disk drives, viewed as a single physical unit by the operating system. True / False

a. scheduler

The I/O ____ allocates the devices, control units, and channels. a. scheduler b. director c. traffic controller d. device handler

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

The Shortest Seek Time First (SSTF) device-scheduling algorithm moves the arm methodically from the inner to the outer track, servicing every request in its path. True / False

a. Highest

The USB controller assigns bandwidth to each device depending on its priority. The ____ priority is assigned to real-time exchanges where no interruption in the data flow is allowed, such as video or sound data. a. Highest b. Lowest c. Standard d. Medium

b. Megabytes

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

False (The I/O subsystem's components)

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. True / False

transfer

The time required for data to be transferred between secondary storage and main memory. best describes _____________ time.

b. lands

To put data on an optical disc requires a high-intensity laser beam, which burns indentations, called pits, and flat areas, called ____. a. valleys b. lands c. hills d. lakes

b. floating gate

To write data to flash memory, a relatively high voltage is sent through one transistor, called the ____, then through a metal oxide layer and into a second transistor called the control gate, where the charge is stored in a cell until it's erased. a. crystalline port b. floating gate c. parallel port d. pit

c. Transport speed

Transfer rate of a magnetic tape is measured in inches per second (ips) using the following formula: transfer rate = density * ____. a. Sector size b. Block size c. Transport speed d. Average access time

Parity

Used for error checking a(n) _________ bit is an extra bit added to a character, word, or other data unit.

search

When discussing disk storage, ________________ time is also known as rotational delay.

Access

When discussing disk storage, ________________ time is the sum of search time plus transfer time.

total access

When discussing disk storage, ________________ time is the sum of search time plus transfer time.

search

When discussing disk storage, ________________ time refers to the time it takes to rotate the disk until the requested record is under the read/write head.

False (DMA is an I/O technique that allows a control unit to directly access main memory. This means that once reading or writing has begun, the remainder of the data can be transferred to and from memory without CPU intervention.)

When using direct memory access (DMA), the CPU controls the transfer of data to and from memory over the system bus. True / False

a. Dedicated

____ peripheral devices are assigned to only one job at a time. a. Dedicated b. Shared c. Virtual d. Static

a. Seek

____ time is the time required to move the arm of a movable-head magnetic drive into position over the proper track. a. Seek b. search c. access d. Transfer

RAID

_______ consists of a set of physical disk drives that is viewed as a single logical unit by the operating system and are controlled in such a way that they speed read access of data on secondary storage devices and aid data recovery.