Disks | Quizlet

The surface of a magnetic disk platter is divided into ____.
A) sectors
B) arms
C) tracks
D) cylinders

C) tracks

On media that uses constant linear velocity, the ____.
A) disk's rotation speed increases as the head moves towards the middle of the disk from either side
B) disk's rotation speed remains constant
C) density of bits decreases from the inner tracks to the outer tracks
D) density of bits per track is uniform

D) density of bits per track is uniform

The SSTF scheduling algorithm ____.
A) services the request with the maximum seek time
B) services the request with the minimum seek time
C) chooses to service the request furthest from the current head position
D) None of the above

B) services the request with the minimum seek time

Consider a disk queue holding requests to the following cylinders in the listed order: 116, 22, 3, 11, 75, 185, 100, 87. Using the SCAN scheduling algorithm, what is the order that the requests are serviced, assuming the disk head is at cylinder 88 and moving upward through the cylinders?
A) 116 - 22 - 3 - 11 - 75 - 185 - 100 - 87
B) 100 - 116 - 185 - 87 - 75 - 22 - 11 - 3
C) 87 - 75 - 100 - 116 - 185 - 22 - 11 - 3
D) 100 - 116 - 185 - 3 - 11 - 22 - 75 - 87

B) 100 - 116 - 185 - 87 - 75 - 22 - 11 - 3

Consider a disk queue holding requests to the following cylinders in the listed order: 116, 22, 3, 11, 75, 185, 100, 87. Using the FCFS scheduling algorithm, what is the order that the requests are serviced, assuming the disk head is at cylinder 88 and moving upward through the cylinders?
A) 116 - 22 - 3 - 11 - 75 - 185 - 100 - 87
B) 100 - 116 - 185 - 87 - 75 - 22 - 11 - 3
C) 87 - 75 - 100 - 116 - 185 - 22 - 11 - 3
D) 100 - 116 - 185 - 3 - 11 - 22 - 75 - 87

A) 116 - 22 - 3 - 11 - 75 - 185 - 100 - 87

Consider a disk queue holding requests to the following cylinders in the listed order: 116, 22, 3, 11, 75, 185, 100, 87. Using the SSTF scheduling algorithm, what is the order that the requests are serviced, assuming the disk head is at cylinder 88 and moving upward through the cylinders?
A) 116 - 22 - 3 - 11 - 75 - 185 - 100 - 87
B) 100 - 116 - 185 - 87 - 75 - 22 - 11 - 3
C) 87 - 75 - 100 - 116 - 185 - 22 - 11 - 3
D) 100 - 116 - 185 - 3 - 11 - 22 - 75 - 87

C) 87 - 75 - 100 - 116 - 185 - 22 - 11 - 3

Consider a disk queue holding requests to the following cylinders in the listed order: 116, 22, 3, 11, 75, 185, 100, 87. Using the C-SCAN scheduling algorithm, what is the order that the requests are serviced, assuming the disk head is at cylinder 88 and moving upward through the cylinders?
A) 116 - 22 - 3 - 11 - 75 - 185 - 100 - 87
B) 100 - 116 - 185 - 87 - 75 - 22 - 11 - 3
C) 87 - 75 - 100 - 116 - 185 - 22 - 11 - 3
D) 100 - 116 - 185 - 3 - 11 - 22 - 75 - 87

D) 100 - 116 - 185 - 3 - 11 - 22 - 75 - 87

Low-level formatting ____.
A) does not usually provide an error-correcting code
B) is usually performed by the purchaser of the disk device
C) is different from physical formatting
D) divides a disk into sections that the disk controller can read and write

D) divides a disk into sections that the disk controller can read and write

Host-attached storage is ____.
A) a special purpose storage system that is accessed remotely over a data network
B) not suitable for hard disks
C) accessed via local I/O ports
D) not suitable for use in raid arrays

C) accessed via local I/O ports

Swap space management ____.
A) is a high-level operating system task
B) tries to provide the best throughput for the virtual memory system
C) is primarily used to increase the reliability of data in a system
D) None of the above

B) tries to provide the best throughput for the virtual memory system

A RAID structure ____.
A) is primarily used for security reasons
B) is primarily used to ensure higher data reliability
C) stands for redundant arrays of inexpensive disks
D) is primarily used to decrease the dependence on disk drives

B) is primarily used to ensure higher data reliability

RAID level ____ is the most common parity RAID system.
A) 0
B) 0+1
C) 4
D) 5

D) 5

Which of the following disk head scheduling algorithms does not take into account the current position of the disk head?
A) FCFS
B) SSTF
C) SCAN
D) LOOK

A) FCFS

The location where Windows places its boot code is the _____.
A) boot block
B) master boot record (MBR)
C) boot partition
D) boot disk

B) master boot record (MBR)

What are the two components of positioning time?
A) seek time + rotational latency
B) transfer time + transfer rate
C) effective transfer rate - transfer rate
D) cylinder positioning time + disk arm positioning time

A) seek time + rotational latency

Which of the following statements is false?
A) Swapping works in conjunction with virtual memory techniques.
B) Some systems allow for multiple swap spaces (disks).
C) Solaris only swaps pages of anonymous memory.
D) Typically, entire processes are swapped into memory.

D) Typically, entire processes are swapped into memory.

_____ is a technique for managing bad blocks that maps a bad sector to a spare sector.
A) Sector slipping
B) Sector sparing
C) Bad block mapping
D) Hard error management

B) Sector sparing

Which RAID level is best for storing large volumes of data?
A) RAID levels 0 + 1 and 1 + 0
B) RAID level 3
C) RAID level 4
D) RAID level 5

D) RAID level 5

A _____ is a private network connecting servers and storage units.
A) host-attached storage
B) network-attached storage
C) storage-area network
D) private-area network

C) storage-area network

Which of the following statements regarding solid state disks (SSDs) is false?
A) They generally consume more power than traditional hard disks.
B) They have the same characteristics as magnetic hard disks, but can be more reliable.
C) They are generally more expensive per megabyte than traditional hard disks.
D) They have no seek time or latency.

A) They generally consume more power than traditional hard disks.

Solid state disks (SSDs) commonly use the ___________ disk scheduling policy.
A) SSTF
B) SCAN
C) FCFS
D) LOOK

C) FCFS

Disk controllers do not usually have a built-in cache.
TRUE
FALSE

FALSE

In Solaris, swap space is only used as a backing store for pages of anonymous memory.
TRUE
FALSE

TRUE

In asynchronous replication, each block is written locally and remotely before the write is considered complete.
TRUE
FALSE

FALSE

Solid state disks (SSDs) commonly use the FCFS disk scheduling algorithm.
TRUE
FALSE

TRUE

In most RAID implementations, a hot spare disk is not used for data, but is configured for replacement should any other disk fail.
TRUE
FALSE

TRUE

LOOK disk head scheduling offers no practical benefit over SCAN disk head scheduling.
TRUE
FALSE

FALSE

Windows allows a hard disk to be divided into one or more partitions
TRUE
FALSE

TRUE

RAID level 0 provides no redundancy.
TRUE
FALSE

TRUE

Data striping provides reliability for RAID systems.
TRUE
FALSE

FALSE

In general, LOOK disk head scheduling will involve less movement of the disk heads than SCAN disk head scheduling.
TRUE
FALSE

TRUE