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Exam 7: Device Management

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Question 1

True/False

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

A) True
B) False

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Question 2

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The I/O ____ allocates the devices,control units,and channels.

A) scheduler
B) traffic controller
C) device handler
D) director

E) B) and C)
F) A) and D)

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Question 3

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

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

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.

An optical disc drive spins at a constant speed-this is called constant linear velocity.

Buffers are used to synchronize the movement of data between the relatively slow I/O devices and the very fast CPU.

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

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.

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

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

In the N-Step SCAN device-scheduling algorithm,any requests that arrive while the arm is in motion are grouped for the arm's next sweep.

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

A dual-layer,single-sided DVD can hold the equivalent of ____ CDs.

Seek time is the most important characteristic of a fixed-head disk drive.

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

The ____ is a hardware flag that must be tested by the CPU to determine when a device has completed an operation.

If 2.5 minutes is the maximum access time for a magnetic tape,____ is the average access time.

A seek strategy for an I/O device handler is the predetermined policy that the device handler uses to allocate access to the device among the many processes that may be waiting for it.It determines the order in which the processes get the device; the goal is to keep transfer time to a minimum.

____ time is the time required to move the arm of a movable-head magnetic drive into position over the proper track.