Chapter 6: Storage

Question 1

Hard Disk Drives (HDDs)

Answer 1

Most common of magnetic media; Nonvolatile

Question 2

Solid State Drives (SDD)

Answer 2

Used to store operating systems and files, similar to a magnetic hard disk drive; Write data to nonvolatile microchips or to DRAM

Question 3

Capacity

Answer 3

Accessible capacity varies depending on the environment the hard drive is used in

Question 4

Data Throughput

Answer 4

The actual data transfer rate, usually less than the maximum

Question 5

Cache (Buffer)

Answer 5

Cache on most hard drives is on-board DRAM

Question 6

Rotational Speed (Magnetic disks only)

Answer 6

Platters in the example hard drive can rotate a maximum of 7,200 RPM; Other typical speeds are 5,400 RPM and 10,000 RPM

Question 7

Latency (Magnetic disks only)

Answer 7

Delay in time before a particular sector on the platter can be read

Question 8

Defragment (Defragging)

Answer 8

Rearranges the data on a partition or volume so that it is laid out in a contiguous, orderly fashion

Question 9

Hot-swappable

Answer 9

Drives that can be removed and replaced while the device is on

Question 10

Fault tolerance

Answer 10

The capability of the hard drive system to continue working after there is a problem with one of the drives

Question 11

RAID 1

Answer 11

Striping; Not fault tolerant; 2 minimum number of disks

Question 12

RAID 1

Answer 12

Mirroring; Fault tolerant; Only 2 disks

Question 13

RAID 5

Answer 13

Striping with Parity; Fault tolerant; 3 minimum number of disks

Question 14

RAID 10

Answer 14

Combines the advantages of RAID 1 and RAID 0; Fault tolerant; 2 minimum number of disks

Question 15

Calculate the maximum read speed of a CD-ROM drive 48x

Answer 15

48 x 150 KB = 7.2 MB/s

Question 16

CD-R

Answer 16

Compact Disc-Recordable; 48x (7.2 MB/s) or 52x (7.8 MB/s)

Question 17

CD-RW

Answer 17

Compact Disc-ReWritable; 24x (3.6 MB/s) or 32x (4.8 MB/s)

Question 18

Capacity of DVD-5

Answer 18

4.7 GB

Question 19

Capacity of DVD-18

Answer 19

17 GB

Question 20

Calculate the maximum read speed of a DVD drive 16x

Answer 20

16 x 1.32 MB/s = 21 MB/s

Question 21

Blu-ray Disc Recordable (BD-R)

Answer 21

Writes to a Blu-ray disc once

Question 22

Blue-ray Disc Recordable Erasable (BD-RE)

Answer 22

Can be erased and re-recorded multiple times

Question 23

NAND Flash Memory

Answer 23

A type of non-volatile storage technology that does not require power to retain data.

Question 24

Bad Block Management

Answer 24

Maintains a table of the faulty blocks within the USB flash device, making sure not to save data to those blocks; Blocks divided into pages, between 512 bytes and 4 KB; Each page has error detection and correction information

Question 25

Capacity of SD card

Answer 25

4 GB

Question 26

Capacity of SDHC

Answer 26

32 GB

Question 27

Capacity of SDXC

Answer 27

2 TB

Question 28

Standard format for USB flash drives

Answer 28

FAT32

Question 29

Most common file system used by SD cards (especially SDXC)

Answer 29

exFAT

Question 30

Type of controller built into a CF card

Answer 30

ATA