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Tech Support Concepts > chapter 8 > Flashcards

chapter 8 Flashcards

1
Q

The area on a tape or disk in which the head creates a flux reversal is called a ________ ________ or a __________ _____________

A

bit cell

transition cell

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2
Q

Which of the three types of servos that can be used in HDDs is most often used today?

A

Embedded servo

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3
Q

When ZBR is used, which of the tracks have the largest number of sectors?

Which of the tracks permit highest data transfer rates?

A

Outer tracks of the platter, Outer tracks of the platter

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4
Q

It is not necessary to allow a HDD that is brought in from the cold to adjust to room temperature before trying to use it?

A

False

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5
Q

What is the basic shape of a read/write head?

A

U-shaped

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6
Q

Magneto-resistive head assemblies actually contain two heads because a magneto-resistive head cannot write to a medium.

A

True

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7
Q

Name 3 applications of the 2.5” form factor

A

Laptop(notebook) HDDs

SSDs

hybrid drives

All of the above

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8
Q

A Femto slider has 3 distinct areas with complex shapes designed to float at a constant height above the surface of the disk at any location on the disk and to minimize height loss under high-altitude conditions (environment)

A

True

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9
Q

Third-party disk-partitioning tool such as Parted Magic can resize partitions without destroying data

A

True

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10
Q

Which of the items in the list below is Not a desirable result of making magnetic heads for HDDs smaller

A

Enabling faster seek times
Increasing the usable disk surface
Reducing platter wear when the disk starts and stops

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11
Q

What are the step(s) that are required to prepare a HDD for use.

A

Low-level formatting

Partitioning

High-level formatting

All of the above

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12
Q

Voice coil actuator that is characterized by being lightweight but creating azimuth error as it moves the heads across the surface of the platter?

A

Rotary actuator

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13
Q

__________ is the average time for a sector to be available after the heads reach a track

A

Latency

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14
Q

That timing signal is called a __________.

A

clock signal

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15
Q

What is the name of the circuitry that can be used in the read circuit to increase by 40% the amount of data stored on a disk

A

PRML (partial response maximum-likelyhood)

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16
Q

What is the name of the circuitry that can be used in the read circuit to increase by 40% the amount of data stored on a disk

A

PRML (partial response maximum-likelihood)

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17
Q

What is the name of the device that generates waveforms to optimize placement of flux patterns on the disk during writing and converts the waveforms back into binary data during reading?

A

Endec

18
Q

Of the encoding techniques presented in the text, the _________ encoding technique provides the highest recording density.

A

rll

19
Q

A body of material that supports the head is know as a _______________________

A

slider

20
Q

Disk drive storage for computers was actually developed and introduced prior to tape drive storage for computers.

A

False

21
Q

One Terabyte (T) is smaller than one Tebibyte (Ti)

A

True

22
Q

When the flow of current through its coil is reversed it is called a _______________ reversal.

A

flux

23
Q

An unrecoverable error is an error that cannot be corrected even after ECC has been applied.

A

True

24
Q

Write an equation that relates average access time, latency, and average seek time.

A

Access time = Seek time + Latency

25
Q

What type of waveforms does a head output when it is reading a tape or disk?

A

pulse (p 478)

26
Q

Stepper motor mechanisms can move in increments of less than a single track and correct for temperature-induced errors

A

False

27
Q

What is the name of the recording technique that aligns magnetic bits vertically rather than horizontally on the surface of a drive?

A

Perpendicular magnetic recording

28
Q

If the platters of a HDD that are the thin-film

A

The platter looks like a mirror

29
Q

If the platters of a HDD that are oxide-coated

A

The platter looks brownish-orange

30
Q

____________ __________ = the number of bits/inch stored on a track multiplied by the number of tracks/inch

A

areal density

31
Q

On an unmagnetized medium there are many magnetic particles (fields) each with its own direction of polarity. What is the overall resulting magnetism?

A

0

32
Q

The name for all of the identically aligned tracks on both sides of all platters in a HDD is called a __________.

A

cylinder

33
Q

PMR technology was first introduced commercially in floppy disks.

A

True

34
Q

Name the advantages of using glass-ceramic material for the platter of a HDD rather than metal.

A

More rigid (can be made thinner), thermally stable

35
Q

Current best practice is to run a head parking program before shutting the power off on a computer to avoid damaging either the heads or the platters.

A

False

36
Q

What two factors determine media transfer rate of a HDD?

A

track linear density

Platter rotational speed

37
Q

When does a contact start stop head touch the surface of a platter in a HDD?

A

When the drive is powered off

38
Q

When does a contact start stop head not touch the surface of a platter in a HDD?

A

When the drive is powered on (during normal operation)

39
Q

Servo in voice-coil actuators Indicate the position of the heads in relation to cylinders and positions the heads accurately over the cylinders

A

True

40
Q

What action did the HDD industry take to increase storage efficiency and improve read error rates in HDDs?

A

Increased HDD sector size to 4 kB (advanced format) (p 512)

41
Q

The time required for the heads to move from one cylinder to another cylinder a random distance away is called the Average __________ time

A

seek

Tech Support Concepts (14 decks)

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