NST 121- Chapter 7

A standard monitor is the only output device that presents results to the user.

True

____________ follows closely behind the CPU and memory in determining the overall effectiveness of a computer system.

Disk I/O

The signals exchanged between a sender and a receiver is called a ______________

prototype

The simplest way for a CPU to communicate with an I/O device is through polled I/O

True

The large computer systems use an intelligent type of DMA interface known as ______________

I/O channel

CCW means

channel command words

Channel I/O is a type of non-isolated I/O because the systems are equipped with separate I/O buses.

False

Buses having memory on its own do memory transfer _________________

synchronously

Two types of transmission modes are serial and parallel transmission modes.

True

Serial transfer methods can be used for time-sensitive isochronous data transfers.

True

______________are divisions of concentric circles called tracks in disk drives.

Sectors

Cylinders describe circular areas on each disk in Rigid Disk Drives.

True

If a read/write head in Rigid Disk Drives were to touch the surface of the disk, the disk would become unusable. This condition is known as a ___________________

head crash

COLD means

computer output laser disc

Lineal spaces between the pits in a CD-ROM are called ____________

lands

Rewritable optical media replace the dye and reflective coating layers of a CD-R disk with a nonmetallic alloy.

False

The storage systems that are not protected by RAID are known as just a bunch of disks (JBOD).

False

RAID Level 1, or RAID-1, is also known as disk mirroring.

True

A hologram is a three-dimensional image rendered by the manipulation of laser beams.

True

Memristor memories are a type of volatile RAM.

False

The I/O modules take care of data movement between main memory and a particular device interface.

True

A simpler and more elegant approach is memory-mapped I/O because I/O devices and main memory share the ____________________.

same address space

Electrical signal loss over time or distance during data transfer is called an _______________.

attenuation

The extra line used for synchronization in parallel data transmission is called a ______________.

strobe

Solid-state drives consist of a microcontroller and flash memory.

True

________________ is a technique that distributes data and erase/write cycles evenly over the entire disk to extend the life of the disk.

Wear leveling

DVDs rotate at about ______________ times the speed of CDs.

Three

Ultra Density Optical disks can store up to ______________ and _____________ respectively.

23GB and 60GB

Systems that require high availability and must be able to tolerate more than one concurrent drive failure use________________.

RAID 6

Large systems are also limited to using only one type of RAID.

False

______________ devices offer another approach to transcend the limits of magnetic storage.

Micro-electro-mechanical

Holographic data storage stores enormous data density by using _________________.

three-dimensional medium

MTTR means

Mean Time To Repair

The disadvantage of RAID-1 is that it is costly and requires large memory space.

True

Like RAID-6, RAID DP can tolerate the simultaneous loss of two disk drives without loss of data.

True

_________________ law states the interrelationship of all components with the overall efficiency of a computer system with a simple formula.

Amdahl's

Disk and tape are forms of _______________ storage.

durable

I/O channels are driven by small CPUs called I/O processors (IOPs).

True

Engineers describe bus operation through clearer and precise pictures known as _________________.

timing diagrams

Disk drives sometimes "skip around" to allow time for the drive circuitry to process the contents of a sector prior to reading the next sector. This is called as interpathing.

False

CD-ROMs are are made up of ________________.

polycarbonate

______________ is the oldest and most cost-effective of all mass-storage devices.

Magnetic tape

In RAID-2, the error-correction information generated in additional drive is using ____________.

Hamming code

Big data is measured in ______________ bytes.

tera

RAID-2 writes one bit per strip instead of writing data in blocks of arbitrary size.

True